* [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8
2017-01-10 13:32 [PATCH 0/2] xen/net: limit number of tx/rx queues Juergen Gross
@ 2017-01-10 13:32 ` Juergen Gross
2017-01-10 14:53 ` Boris Ostrovsky
2017-01-10 14:53 ` Boris Ostrovsky
2017-01-10 13:32 ` Juergen Gross
` (5 subsequent siblings)
6 siblings, 2 replies; 13+ messages in thread
From: Juergen Gross @ 2017-01-10 13:32 UTC (permalink / raw)
To: linux-kernel, xen-devel, netdev
Cc: boris.ostrovsky, wei.liu2, paul.durrant, Juergen Gross
The default for the number of tx/rx queues of one interface is the
number of vcpus of the system today. As each queue pair reserves 512
grant pages this default consumes a ridiculous number of grants for
large guests.
Limit the queue number to 8 as default. This value can be modified
via a module parameter if required.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/net/xen-netfront.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index a479cd9..490c865 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -57,6 +57,7 @@
#include <xen/interface/grant_table.h>
/* Module parameters */
+#define MAX_QUEUES_DEFAULT 8
static unsigned int xennet_max_queues;
module_param_named(max_queues, xennet_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
@@ -2164,11 +2165,12 @@ static int __init netif_init(void)
pr_info("Initialising Xen virtual ethernet driver\n");
- /* Allow as many queues as there are CPUs if user has not
+ /* Allow as many queues as there are CPUs inut max. 8 if user has not
* specified a value.
*/
if (xennet_max_queues == 0)
- xennet_max_queues = num_online_cpus();
+ xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
+ num_online_cpus());
return xenbus_register_frontend(&netfront_driver);
}
--
2.10.2
^ permalink raw reply related [flat|nested] 13+ messages in thread* Re: [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8
2017-01-10 13:32 ` [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8 Juergen Gross
@ 2017-01-10 14:53 ` Boris Ostrovsky
2017-01-10 14:53 ` Boris Ostrovsky
1 sibling, 0 replies; 13+ messages in thread
From: Boris Ostrovsky @ 2017-01-10 14:53 UTC (permalink / raw)
To: Juergen Gross, linux-kernel, xen-devel, netdev; +Cc: paul.durrant, wei.liu2
On 01/10/2017 08:32 AM, Juergen Gross wrote:
> The default for the number of tx/rx queues of one interface is the
> number of vcpus of the system today. As each queue pair reserves 512
> grant pages this default consumes a ridiculous number of grants for
> large guests.
>
> Limit the queue number to 8 as default. This value can be modified
> via a module parameter if required.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
> drivers/net/xen-netfront.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index a479cd9..490c865 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -57,6 +57,7 @@
> #include <xen/interface/grant_table.h>
>
> /* Module parameters */
> +#define MAX_QUEUES_DEFAULT 8
> static unsigned int xennet_max_queues;
> module_param_named(max_queues, xennet_max_queues, uint, 0644);
> MODULE_PARM_DESC(max_queues,
> @@ -2164,11 +2165,12 @@ static int __init netif_init(void)
>
> pr_info("Initialising Xen virtual ethernet driver\n");
>
> - /* Allow as many queues as there are CPUs if user has not
> + /* Allow as many queues as there are CPUs inut max. 8 if user has not
Based on comment change in the second patch: s/inut/but/ ? Also, comment
style in both patches.
Other than that, for both:
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> * specified a value.
> */
> if (xennet_max_queues == 0)
> - xennet_max_queues = num_online_cpus();
> + xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
> + num_online_cpus());
>
> return xenbus_register_frontend(&netfront_driver);
> }
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8
2017-01-10 13:32 ` [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8 Juergen Gross
2017-01-10 14:53 ` Boris Ostrovsky
@ 2017-01-10 14:53 ` Boris Ostrovsky
2017-01-10 15:02 ` Juergen Gross
2017-01-10 15:02 ` Juergen Gross
1 sibling, 2 replies; 13+ messages in thread
From: Boris Ostrovsky @ 2017-01-10 14:53 UTC (permalink / raw)
To: Juergen Gross, linux-kernel, xen-devel, netdev; +Cc: wei.liu2, paul.durrant
On 01/10/2017 08:32 AM, Juergen Gross wrote:
> The default for the number of tx/rx queues of one interface is the
> number of vcpus of the system today. As each queue pair reserves 512
> grant pages this default consumes a ridiculous number of grants for
> large guests.
>
> Limit the queue number to 8 as default. This value can be modified
> via a module parameter if required.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
> drivers/net/xen-netfront.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index a479cd9..490c865 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -57,6 +57,7 @@
> #include <xen/interface/grant_table.h>
>
> /* Module parameters */
> +#define MAX_QUEUES_DEFAULT 8
> static unsigned int xennet_max_queues;
> module_param_named(max_queues, xennet_max_queues, uint, 0644);
> MODULE_PARM_DESC(max_queues,
> @@ -2164,11 +2165,12 @@ static int __init netif_init(void)
>
> pr_info("Initialising Xen virtual ethernet driver\n");
>
> - /* Allow as many queues as there are CPUs if user has not
> + /* Allow as many queues as there are CPUs inut max. 8 if user has not
Based on comment change in the second patch: s/inut/but/ ? Also, comment
style in both patches.
Other than that, for both:
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> * specified a value.
> */
> if (xennet_max_queues == 0)
> - xennet_max_queues = num_online_cpus();
> + xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
> + num_online_cpus());
>
> return xenbus_register_frontend(&netfront_driver);
> }
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8
2017-01-10 14:53 ` Boris Ostrovsky
@ 2017-01-10 15:02 ` Juergen Gross
2017-01-10 15:02 ` Juergen Gross
1 sibling, 0 replies; 13+ messages in thread
From: Juergen Gross @ 2017-01-10 15:02 UTC (permalink / raw)
To: Boris Ostrovsky, linux-kernel, xen-devel, netdev; +Cc: wei.liu2, paul.durrant
On 10/01/17 15:53, Boris Ostrovsky wrote:
> On 01/10/2017 08:32 AM, Juergen Gross wrote:
>> The default for the number of tx/rx queues of one interface is the
>> number of vcpus of the system today. As each queue pair reserves 512
>> grant pages this default consumes a ridiculous number of grants for
>> large guests.
>>
>> Limit the queue number to 8 as default. This value can be modified
>> via a module parameter if required.
>>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>> ---
>> drivers/net/xen-netfront.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
>> index a479cd9..490c865 100644
>> --- a/drivers/net/xen-netfront.c
>> +++ b/drivers/net/xen-netfront.c
>> @@ -57,6 +57,7 @@
>> #include <xen/interface/grant_table.h>
>>
>> /* Module parameters */
>> +#define MAX_QUEUES_DEFAULT 8
>> static unsigned int xennet_max_queues;
>> module_param_named(max_queues, xennet_max_queues, uint, 0644);
>> MODULE_PARM_DESC(max_queues,
>> @@ -2164,11 +2165,12 @@ static int __init netif_init(void)
>>
>> pr_info("Initialising Xen virtual ethernet driver\n");
>>
>> - /* Allow as many queues as there are CPUs if user has not
>> + /* Allow as many queues as there are CPUs inut max. 8 if user has not
>
> Based on comment change in the second patch: s/inut/but/ ? Also, comment
> style in both patches.
Typo: yes
Style: no. checkpatch tells me that the net directory doesn't follow
common kernel style.
>
> Other than that, for both:
>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Thanks,
Juergen
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8
2017-01-10 14:53 ` Boris Ostrovsky
2017-01-10 15:02 ` Juergen Gross
@ 2017-01-10 15:02 ` Juergen Gross
1 sibling, 0 replies; 13+ messages in thread
From: Juergen Gross @ 2017-01-10 15:02 UTC (permalink / raw)
To: Boris Ostrovsky, linux-kernel, xen-devel, netdev; +Cc: paul.durrant, wei.liu2
On 10/01/17 15:53, Boris Ostrovsky wrote:
> On 01/10/2017 08:32 AM, Juergen Gross wrote:
>> The default for the number of tx/rx queues of one interface is the
>> number of vcpus of the system today. As each queue pair reserves 512
>> grant pages this default consumes a ridiculous number of grants for
>> large guests.
>>
>> Limit the queue number to 8 as default. This value can be modified
>> via a module parameter if required.
>>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>> ---
>> drivers/net/xen-netfront.c | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
>> index a479cd9..490c865 100644
>> --- a/drivers/net/xen-netfront.c
>> +++ b/drivers/net/xen-netfront.c
>> @@ -57,6 +57,7 @@
>> #include <xen/interface/grant_table.h>
>>
>> /* Module parameters */
>> +#define MAX_QUEUES_DEFAULT 8
>> static unsigned int xennet_max_queues;
>> module_param_named(max_queues, xennet_max_queues, uint, 0644);
>> MODULE_PARM_DESC(max_queues,
>> @@ -2164,11 +2165,12 @@ static int __init netif_init(void)
>>
>> pr_info("Initialising Xen virtual ethernet driver\n");
>>
>> - /* Allow as many queues as there are CPUs if user has not
>> + /* Allow as many queues as there are CPUs inut max. 8 if user has not
>
> Based on comment change in the second patch: s/inut/but/ ? Also, comment
> style in both patches.
Typo: yes
Style: no. checkpatch tells me that the net directory doesn't follow
common kernel style.
>
> Other than that, for both:
>
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Thanks,
Juergen
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 13+ messages in thread
* [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8
2017-01-10 13:32 [PATCH 0/2] xen/net: limit number of tx/rx queues Juergen Gross
2017-01-10 13:32 ` [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8 Juergen Gross
@ 2017-01-10 13:32 ` Juergen Gross
2017-01-10 13:32 ` [PATCH 2/2] xen/netback: " Juergen Gross
` (4 subsequent siblings)
6 siblings, 0 replies; 13+ messages in thread
From: Juergen Gross @ 2017-01-10 13:32 UTC (permalink / raw)
To: linux-kernel, xen-devel, netdev
Cc: Juergen Gross, boris.ostrovsky, paul.durrant, wei.liu2
The default for the number of tx/rx queues of one interface is the
number of vcpus of the system today. As each queue pair reserves 512
grant pages this default consumes a ridiculous number of grants for
large guests.
Limit the queue number to 8 as default. This value can be modified
via a module parameter if required.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/net/xen-netfront.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index a479cd9..490c865 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -57,6 +57,7 @@
#include <xen/interface/grant_table.h>
/* Module parameters */
+#define MAX_QUEUES_DEFAULT 8
static unsigned int xennet_max_queues;
module_param_named(max_queues, xennet_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
@@ -2164,11 +2165,12 @@ static int __init netif_init(void)
pr_info("Initialising Xen virtual ethernet driver\n");
- /* Allow as many queues as there are CPUs if user has not
+ /* Allow as many queues as there are CPUs inut max. 8 if user has not
* specified a value.
*/
if (xennet_max_queues == 0)
- xennet_max_queues = num_online_cpus();
+ xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
+ num_online_cpus());
return xenbus_register_frontend(&netfront_driver);
}
--
2.10.2
_______________________________________________
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Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 13+ messages in thread* [PATCH 2/2] xen/netback: set default upper limit of tx/rx queues to 8
2017-01-10 13:32 [PATCH 0/2] xen/net: limit number of tx/rx queues Juergen Gross
2017-01-10 13:32 ` [PATCH 1/2] xen/netfront: set default upper limit of tx/rx queues to 8 Juergen Gross
2017-01-10 13:32 ` Juergen Gross
@ 2017-01-10 13:32 ` Juergen Gross
2017-01-10 13:32 ` Juergen Gross
` (3 subsequent siblings)
6 siblings, 0 replies; 13+ messages in thread
From: Juergen Gross @ 2017-01-10 13:32 UTC (permalink / raw)
To: linux-kernel, xen-devel, netdev
Cc: Juergen Gross, boris.ostrovsky, paul.durrant, wei.liu2
The default for the maximum number of tx/rx queues of one interface is
the number of cpus of the system today. As each queue pair reserves 512
grant pages this default consumes a ridiculous number of grants for
large guests.
Limit the queue number to 8 as default. This value can be modified
via a module parameter if required.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/net/xen-netback/netback.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 47b4810..f9bcf4a 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -67,6 +67,7 @@ module_param(rx_drain_timeout_msecs, uint, 0444);
unsigned int rx_stall_timeout_msecs = 60000;
module_param(rx_stall_timeout_msecs, uint, 0444);
+#define MAX_QUEUES_DEFAULT 8
unsigned int xenvif_max_queues;
module_param_named(max_queues, xenvif_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
@@ -1622,11 +1623,12 @@ static int __init netback_init(void)
if (!xen_domain())
return -ENODEV;
- /* Allow as many queues as there are CPUs if user has not
+ /* Allow as many queues as there are CPUs but max. 8 if user has not
* specified a value.
*/
if (xenvif_max_queues == 0)
- xenvif_max_queues = num_online_cpus();
+ xenvif_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
+ num_online_cpus());
if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) {
pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n",
--
2.10.2
_______________________________________________
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Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 13+ messages in thread* [PATCH 2/2] xen/netback: set default upper limit of tx/rx queues to 8
2017-01-10 13:32 [PATCH 0/2] xen/net: limit number of tx/rx queues Juergen Gross
` (2 preceding siblings ...)
2017-01-10 13:32 ` [PATCH 2/2] xen/netback: " Juergen Gross
@ 2017-01-10 13:32 ` Juergen Gross
2017-01-10 13:54 ` [PATCH 0/2] xen/net: limit number of tx/rx queues Wei Liu
` (2 subsequent siblings)
6 siblings, 0 replies; 13+ messages in thread
From: Juergen Gross @ 2017-01-10 13:32 UTC (permalink / raw)
To: linux-kernel, xen-devel, netdev
Cc: boris.ostrovsky, wei.liu2, paul.durrant, Juergen Gross
The default for the maximum number of tx/rx queues of one interface is
the number of cpus of the system today. As each queue pair reserves 512
grant pages this default consumes a ridiculous number of grants for
large guests.
Limit the queue number to 8 as default. This value can be modified
via a module parameter if required.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/net/xen-netback/netback.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 47b4810..f9bcf4a 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -67,6 +67,7 @@ module_param(rx_drain_timeout_msecs, uint, 0444);
unsigned int rx_stall_timeout_msecs = 60000;
module_param(rx_stall_timeout_msecs, uint, 0444);
+#define MAX_QUEUES_DEFAULT 8
unsigned int xenvif_max_queues;
module_param_named(max_queues, xenvif_max_queues, uint, 0644);
MODULE_PARM_DESC(max_queues,
@@ -1622,11 +1623,12 @@ static int __init netback_init(void)
if (!xen_domain())
return -ENODEV;
- /* Allow as many queues as there are CPUs if user has not
+ /* Allow as many queues as there are CPUs but max. 8 if user has not
* specified a value.
*/
if (xenvif_max_queues == 0)
- xenvif_max_queues = num_online_cpus();
+ xenvif_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT,
+ num_online_cpus());
if (fatal_skb_slots < XEN_NETBK_LEGACY_SLOTS_MAX) {
pr_info("fatal_skb_slots too small (%d), bump it to XEN_NETBK_LEGACY_SLOTS_MAX (%d)\n",
--
2.10.2
^ permalink raw reply related [flat|nested] 13+ messages in thread* Re: [PATCH 0/2] xen/net: limit number of tx/rx queues
2017-01-10 13:32 [PATCH 0/2] xen/net: limit number of tx/rx queues Juergen Gross
` (3 preceding siblings ...)
2017-01-10 13:32 ` Juergen Gross
@ 2017-01-10 13:54 ` Wei Liu
2017-01-10 13:54 ` Wei Liu
2017-01-30 2:55 ` Boris Ostrovsky
6 siblings, 0 replies; 13+ messages in thread
From: Wei Liu @ 2017-01-10 13:54 UTC (permalink / raw)
To: Juergen Gross
Cc: linux-kernel, xen-devel, netdev, boris.ostrovsky, wei.liu2, paul.durrant
On Tue, Jan 10, 2017 at 02:32:50PM +0100, Juergen Gross wrote:
> The Xen network frontend/backend supports multiple tx/rx queues for one
> virtual interface. The number of queues supported by the backend is
> set to the number of cpus of the backend driver domain (usually dom0)
> and the number of queues requested by the frontend is limited by the
> number of vcpus of the related guest.
>
> On large systems this can lead to ridiculous large number of queues
> exhausting the required number of grant pages rather quick.
>
> To avoid this limit the default maximum on both sides to 8. Both
> frontend and backend maximum can be individually tuned via module
> parameters.
>
> Juergen Gross (2):
> xen/netfront: set default upper limit of tx/rx queues to 8
> xen/netback: set default upper limit of tx/rx queues to 8
>
Acked-by: Wei Liu <wei.liu2@citrix.com>
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [PATCH 0/2] xen/net: limit number of tx/rx queues
2017-01-10 13:32 [PATCH 0/2] xen/net: limit number of tx/rx queues Juergen Gross
` (4 preceding siblings ...)
2017-01-10 13:54 ` [PATCH 0/2] xen/net: limit number of tx/rx queues Wei Liu
@ 2017-01-10 13:54 ` Wei Liu
2017-01-30 2:55 ` Boris Ostrovsky
6 siblings, 0 replies; 13+ messages in thread
From: Wei Liu @ 2017-01-10 13:54 UTC (permalink / raw)
To: Juergen Gross
Cc: wei.liu2, netdev, linux-kernel, paul.durrant, xen-devel, boris.ostrovsky
On Tue, Jan 10, 2017 at 02:32:50PM +0100, Juergen Gross wrote:
> The Xen network frontend/backend supports multiple tx/rx queues for one
> virtual interface. The number of queues supported by the backend is
> set to the number of cpus of the backend driver domain (usually dom0)
> and the number of queues requested by the frontend is limited by the
> number of vcpus of the related guest.
>
> On large systems this can lead to ridiculous large number of queues
> exhausting the required number of grant pages rather quick.
>
> To avoid this limit the default maximum on both sides to 8. Both
> frontend and backend maximum can be individually tuned via module
> parameters.
>
> Juergen Gross (2):
> xen/netfront: set default upper limit of tx/rx queues to 8
> xen/netback: set default upper limit of tx/rx queues to 8
>
Acked-by: Wei Liu <wei.liu2@citrix.com>
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [PATCH 0/2] xen/net: limit number of tx/rx queues
2017-01-10 13:32 [PATCH 0/2] xen/net: limit number of tx/rx queues Juergen Gross
@ 2017-01-30 2:55 ` Boris Ostrovsky
2017-01-10 13:32 ` Juergen Gross
` (5 subsequent siblings)
6 siblings, 0 replies; 13+ messages in thread
From: Boris Ostrovsky @ 2017-01-30 2:55 UTC (permalink / raw)
To: Juergen Gross, linux-kernel, xen-devel, netdev; +Cc: wei.liu2, paul.durrant
On 01/10/2017 08:32 AM, Juergen Gross wrote:
> The Xen network frontend/backend supports multiple tx/rx queues for one
> virtual interface. The number of queues supported by the backend is
> set to the number of cpus of the backend driver domain (usually dom0)
> and the number of queues requested by the frontend is limited by the
> number of vcpus of the related guest.
>
> On large systems this can lead to ridiculous large number of queues
> exhausting the required number of grant pages rather quick.
>
> To avoid this limit the default maximum on both sides to 8. Both
> frontend and backend maximum can be individually tuned via module
> parameters.
>
> Juergen Gross (2):
> xen/netfront: set default upper limit of tx/rx queues to 8
> xen/netback: set default upper limit of tx/rx queues to 8
>
> drivers/net/xen-netback/netback.c | 6 ++++--
> drivers/net/xen-netfront.c | 6 ++++--
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
Applied to for-linus-4.11
-boris
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [PATCH 0/2] xen/net: limit number of tx/rx queues
@ 2017-01-30 2:55 ` Boris Ostrovsky
0 siblings, 0 replies; 13+ messages in thread
From: Boris Ostrovsky @ 2017-01-30 2:55 UTC (permalink / raw)
To: Juergen Gross, linux-kernel, xen-devel, netdev; +Cc: paul.durrant, wei.liu2
On 01/10/2017 08:32 AM, Juergen Gross wrote:
> The Xen network frontend/backend supports multiple tx/rx queues for one
> virtual interface. The number of queues supported by the backend is
> set to the number of cpus of the backend driver domain (usually dom0)
> and the number of queues requested by the frontend is limited by the
> number of vcpus of the related guest.
>
> On large systems this can lead to ridiculous large number of queues
> exhausting the required number of grant pages rather quick.
>
> To avoid this limit the default maximum on both sides to 8. Both
> frontend and backend maximum can be individually tuned via module
> parameters.
>
> Juergen Gross (2):
> xen/netfront: set default upper limit of tx/rx queues to 8
> xen/netback: set default upper limit of tx/rx queues to 8
>
> drivers/net/xen-netback/netback.c | 6 ++++--
> drivers/net/xen-netfront.c | 6 ++++--
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
Applied to for-linus-4.11
-boris
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