* XL low memory
@ 2013-05-29 5:22 Dominic Russell
2013-05-29 13:00 ` Ben Guthro
0 siblings, 1 reply; 4+ messages in thread
From: Dominic Russell @ 2013-05-29 5:22 UTC (permalink / raw)
To: xen-devel
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Hello,
With xl toolstack, is it possible to declare a low memory parameters, like we could with xend in the xend-config.sxp file, with the (dom0-min-mem) parameter?
I did try to google this, but could only find information about the xend-config file, which xl does not read.
I have a Dell server, on which I tested that the minimum it can go before crashing the kernel is 224mb, but the current minimum set in libxl_internal.h is only 128mb! By the mean time, I changed the constant and recompiled 4.2.2. To have a parameter would be easier :).
Thanks,
Dominic
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: XL low memory
2013-05-29 5:22 XL low memory Dominic Russell
@ 2013-05-29 13:00 ` Ben Guthro
2013-05-29 13:58 ` Dominic Russell
0 siblings, 1 reply; 4+ messages in thread
From: Ben Guthro @ 2013-05-29 13:00 UTC (permalink / raw)
To: Dominic Russell; +Cc: xen-devel
On Wed, May 29, 2013 at 1:22 AM, Dominic Russell <GTA_doum@hotmail.com> wrote:
> Hello,
>
> With xl toolstack, is it possible to declare a low memory parameters, like
> we could with xend in the xend-config.sxp file, with the (dom0-min-mem)
> parameter?
>
> I did try to google this, but could only find information about the
> xend-config file, which xl does not read.
> I have a Dell server, on which I tested that the minimum it can go before
> crashing the kernel is 224mb, but the current minimum set in
> libxl_internal.h is only 128mb! By the mean time, I changed the constant
> and recompiled 4.2.2. To have a parameter would be easier :).
Hi,
You can do this with Xen command line parameters, at boot time.
See the first section of the following wiki page for reference:
http://wiki.xen.org/wiki/Xen_Best_Practices
Ben
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: XL low memory
2013-05-29 13:00 ` Ben Guthro
@ 2013-05-29 13:58 ` Dominic Russell
2013-05-29 14:02 ` Ben Guthro
0 siblings, 1 reply; 4+ messages in thread
From: Dominic Russell @ 2013-05-29 13:58 UTC (permalink / raw)
To: Ben Guthro; +Cc: xen-devel
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Hello,
My understanding of this parameter, is that it sets the starting amount of memory, and the maximum authorized. The memory could be ballooned down anyway! Is that the case?
I want to keep the balloon feature for now, because there is only two gigs of RAM on this computer...
Thanks,
Dominic
From: Ben Guthro
Sent: Wednesday, May 29, 2013 9:00 AM
To: Dominic Russell
Cc: xen-devel@lists.xensource.com
Subject: Re: [Xen-devel] XL low memory
On Wed, May 29, 2013 at 1:22 AM, Dominic Russell <GTA_doum@hotmail.com> wrote:
> Hello,
>
> With xl toolstack, is it possible to declare a low memory parameters, like
> we could with xend in the xend-config.sxp file, with the (dom0-min-mem)
> parameter?
>
> I did try to google this, but could only find information about the
> xend-config file, which xl does not read.
> I have a Dell server, on which I tested that the minimum it can go before
> crashing the kernel is 224mb, but the current minimum set in
> libxl_internal.h is only 128mb! By the mean time, I changed the constant
> and recompiled 4.2.2. To have a parameter would be easier :).
Hi,
You can do this with Xen command line parameters, at boot time.
See the first section of the following wiki page for reference:
http://wiki.xen.org/wiki/Xen_Best_Practices
Ben
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: XL low memory
2013-05-29 13:58 ` Dominic Russell
@ 2013-05-29 14:02 ` Ben Guthro
0 siblings, 0 replies; 4+ messages in thread
From: Ben Guthro @ 2013-05-29 14:02 UTC (permalink / raw)
To: Dominic Russell; +Cc: xen-devel
See the comments in domain_build.c above parse_dom0_mem for details:
http://tinyurl.com/pdtjje9
/*
* dom0_mem=[min:<min_amt>,][max:<max_amt>,][<amt>]
*
* <min_amt>: The minimum amount of memory which should be allocated for dom0.
* <max_amt>: The maximum amount of memory which should be allocated for dom0.
* <amt>: The precise amount of memory to allocate for dom0.
*
* Notes:
* 1. <amt> is clamped from below by <min_amt> and from above by available
* memory and <max_amt>
* 2. <min_amt> is clamped from above by available memory and <max_amt>
* 3. <min_amt> is ignored if it is greater than <max_amt>
* 4. If <amt> is not specified, it is calculated as follows:
* "All of memory is allocated to domain 0, minus 1/16th which is reserved
* for uses such as DMA buffers (the reservation is clamped to 128MB)."
*
* Each value can be specified as positive or negative:
* If +ve: The specified amount is an absolute value.
* If -ve: The specified amount is subtracted from total available memory.
*/
min:XXX will not be ballooned lower than specified.
On Wed, May 29, 2013 at 9:58 AM, Dominic Russell <GTA_doum@hotmail.com> wrote:
> Hello,
>
> My understanding of this parameter, is that it sets the starting amount of
> memory, and the maximum authorized. The memory could be ballooned down
> anyway! Is that the case?
> I want to keep the balloon feature for now, because there is only two gigs
> of RAM on this computer...
>
> Thanks,
> Dominic
>
> From: Ben Guthro
> Sent: Wednesday, May 29, 2013 9:00 AM
> To: Dominic Russell
> Cc: xen-devel@lists.xensource.com
> Subject: Re: [Xen-devel] XL low memory
>
> On Wed, May 29, 2013 at 1:22 AM, Dominic Russell <GTA_doum@hotmail.com>
> wrote:
>> Hello,
>>
>> With xl toolstack, is it possible to declare a low memory parameters, like
>> we could with xend in the xend-config.sxp file, with the (dom0-min-mem)
>> parameter?
>>
>> I did try to google this, but could only find information about the
>> xend-config file, which xl does not read.
>> I have a Dell server, on which I tested that the minimum it can go before
>> crashing the kernel is 224mb, but the current minimum set in
>> libxl_internal.h is only 128mb! By the mean time, I changed the constant
>> and recompiled 4.2.2. To have a parameter would be easier :).
>
> Hi,
>
> You can do this with Xen command line parameters, at boot time.
> See the first section of the following wiki page for reference:
>
> http://wiki.xen.org/wiki/Xen_Best_Practices
>
> Ben
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-05-29 5:22 XL low memory Dominic Russell
2013-05-29 13:00 ` Ben Guthro
2013-05-29 13:58 ` Dominic Russell
2013-05-29 14:02 ` Ben Guthro
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