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From: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
To: Anna Schumaker <Anna.Schumaker-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>
Cc: List Linux RDMA Mailing
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux NFS Mailing List
	<linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH v2 19/22] xprtrdma: Support larger inline thresholds
Date: Mon, 29 Aug 2016 16:02:28 -0400	[thread overview]
Message-ID: <741D8723-D193-4F52-826F-807F89DC19C7@oracle.com> (raw)
In-Reply-To: <c922120b-35f3-65bf-e778-3cef645cee48-ZwjVKphTwtPQT0dZR+AlfA@public.gmane.org>


> On Aug 29, 2016, at 3:52 PM, Anna Schumaker <Anna.Schumaker-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org> wrote:
> 
> Hi Chuck,
> 
> On 08/23/2016 01:54 PM, Chuck Lever wrote:
>> RPC-over-RDMA Version Two will likely require at least a 4KB inline
>> threshold by default. The Version One inline threshold is still 1KB,
>> and it's automatically negotiated down to in
>> rpcrdma_update_connect_private.
> 
> I'm curious, what is the status of RPCoRDMA v2?

There is a personal draft published:

  https://datatracker.ietf.org/doc/draft-cel-nfsv4-rpcrdma-version-two/

And being discussed actively in the nfsv4 Working Group.

The features added in this series are usable with the Linux V1 implementation
too; the point being to experiment with these new facilities before we finish
RPC-over-RDMA Version Two.


> Thanks,
> Anna
> 
>> 
>> The maximum is somewhat arbitrary. There's no fundamental
>> architectural limit I'm aware of, but it's good to keep the size of
>> Receive buffers reasonable. Now that Send can use a s/g list, a
>> Send buffer is only as large as each RPC requires. Receive buffers
>> are always the size of the inline threshold, however.
>> 
>> Signed-off-by: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
>> ---
>> include/linux/sunrpc/xprtrdma.h |    4 ++--
>> net/sunrpc/xprtrdma/transport.c |    4 ++--
>> 2 files changed, 4 insertions(+), 4 deletions(-)
>> 
>> diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h
>> index 39267dc..221b7a2 100644
>> --- a/include/linux/sunrpc/xprtrdma.h
>> +++ b/include/linux/sunrpc/xprtrdma.h
>> @@ -53,8 +53,8 @@
>> #define RPCRDMA_MAX_SLOT_TABLE	(256U)
>> 
>> #define RPCRDMA_MIN_INLINE  (1024)	/* min inline thresh */
>> -#define RPCRDMA_DEF_INLINE  (1024)	/* default inline thresh */
>> -#define RPCRDMA_MAX_INLINE  (3068)	/* max inline thresh */
>> +#define RPCRDMA_DEF_INLINE  (4096)	/* default inline thresh */
>> +#define RPCRDMA_MAX_INLINE  (65536)	/* max inline thresh */
>> 
>> /* Memory registration strategies, by number.
>>  * This is part of a kernel / user space API. Do not remove. */
>> diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
>> index 6a358ab..ed5e285 100644
>> --- a/net/sunrpc/xprtrdma/transport.c
>> +++ b/net/sunrpc/xprtrdma/transport.c
>> @@ -97,7 +97,7 @@ static struct ctl_table xr_tunables_table[] = {
>> 		.data		= &xprt_rdma_max_inline_read,
>> 		.maxlen		= sizeof(unsigned int),
>> 		.mode		= 0644,
>> -		.proc_handler	= proc_dointvec,
>> +		.proc_handler	= proc_dointvec_minmax,
>> 		.extra1		= &min_inline_size,
>> 		.extra2		= &max_inline_size,
>> 	},
>> @@ -106,7 +106,7 @@ static struct ctl_table xr_tunables_table[] = {
>> 		.data		= &xprt_rdma_max_inline_write,
>> 		.maxlen		= sizeof(unsigned int),
>> 		.mode		= 0644,
>> -		.proc_handler	= proc_dointvec,
>> +		.proc_handler	= proc_dointvec_minmax,
>> 		.extra1		= &min_inline_size,
>> 		.extra2		= &max_inline_size,
>> 	},
>> 
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
>> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

--
Chuck Lever



--
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WARNING: multiple messages have this Message-ID
From: Chuck Lever <chuck.lever@oracle.com>
To: Anna Schumaker <Anna.Schumaker@netapp.com>
Cc: List Linux RDMA Mailing <linux-rdma@vger.kernel.org>,
	Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH v2 19/22] xprtrdma: Support larger inline thresholds
Date: Mon, 29 Aug 2016 16:02:28 -0400	[thread overview]
Message-ID: <741D8723-D193-4F52-826F-807F89DC19C7@oracle.com> (raw)
In-Reply-To: <c922120b-35f3-65bf-e778-3cef645cee48@Netapp.com>


> On Aug 29, 2016, at 3:52 PM, Anna Schumaker <Anna.Schumaker@netapp.com> wrote:
> 
> Hi Chuck,
> 
> On 08/23/2016 01:54 PM, Chuck Lever wrote:
>> RPC-over-RDMA Version Two will likely require at least a 4KB inline
>> threshold by default. The Version One inline threshold is still 1KB,
>> and it's automatically negotiated down to in
>> rpcrdma_update_connect_private.
> 
> I'm curious, what is the status of RPCoRDMA v2?

There is a personal draft published:

  https://datatracker.ietf.org/doc/draft-cel-nfsv4-rpcrdma-version-two/

And being discussed actively in the nfsv4 Working Group.

The features added in this series are usable with the Linux V1 implementation
too; the point being to experiment with these new facilities before we finish
RPC-over-RDMA Version Two.


> Thanks,
> Anna
> 
>> 
>> The maximum is somewhat arbitrary. There's no fundamental
>> architectural limit I'm aware of, but it's good to keep the size of
>> Receive buffers reasonable. Now that Send can use a s/g list, a
>> Send buffer is only as large as each RPC requires. Receive buffers
>> are always the size of the inline threshold, however.
>> 
>> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
>> ---
>> include/linux/sunrpc/xprtrdma.h |    4 ++--
>> net/sunrpc/xprtrdma/transport.c |    4 ++--
>> 2 files changed, 4 insertions(+), 4 deletions(-)
>> 
>> diff --git a/include/linux/sunrpc/xprtrdma.h b/include/linux/sunrpc/xprtrdma.h
>> index 39267dc..221b7a2 100644
>> --- a/include/linux/sunrpc/xprtrdma.h
>> +++ b/include/linux/sunrpc/xprtrdma.h
>> @@ -53,8 +53,8 @@
>> #define RPCRDMA_MAX_SLOT_TABLE	(256U)
>> 
>> #define RPCRDMA_MIN_INLINE  (1024)	/* min inline thresh */
>> -#define RPCRDMA_DEF_INLINE  (1024)	/* default inline thresh */
>> -#define RPCRDMA_MAX_INLINE  (3068)	/* max inline thresh */
>> +#define RPCRDMA_DEF_INLINE  (4096)	/* default inline thresh */
>> +#define RPCRDMA_MAX_INLINE  (65536)	/* max inline thresh */
>> 
>> /* Memory registration strategies, by number.
>>  * This is part of a kernel / user space API. Do not remove. */
>> diff --git a/net/sunrpc/xprtrdma/transport.c b/net/sunrpc/xprtrdma/transport.c
>> index 6a358ab..ed5e285 100644
>> --- a/net/sunrpc/xprtrdma/transport.c
>> +++ b/net/sunrpc/xprtrdma/transport.c
>> @@ -97,7 +97,7 @@ static struct ctl_table xr_tunables_table[] = {
>> 		.data		= &xprt_rdma_max_inline_read,
>> 		.maxlen		= sizeof(unsigned int),
>> 		.mode		= 0644,
>> -		.proc_handler	= proc_dointvec,
>> +		.proc_handler	= proc_dointvec_minmax,
>> 		.extra1		= &min_inline_size,
>> 		.extra2		= &max_inline_size,
>> 	},
>> @@ -106,7 +106,7 @@ static struct ctl_table xr_tunables_table[] = {
>> 		.data		= &xprt_rdma_max_inline_write,
>> 		.maxlen		= sizeof(unsigned int),
>> 		.mode		= 0644,
>> -		.proc_handler	= proc_dointvec,
>> +		.proc_handler	= proc_dointvec_minmax,
>> 		.extra1		= &min_inline_size,
>> 		.extra2		= &max_inline_size,
>> 	},
>> 
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

--
Chuck Lever




  parent reply	other threads:[~2016-08-29 20:02 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-23 17:52 [PATCH v2 00/22] client-side NFS/RDMA patches proposed for v4.9 Chuck Lever
2016-08-23 17:52 ` Chuck Lever
     [not found] ` <20160823174402.13038.84561.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org>
2016-08-23 17:52   ` [PATCH v2 01/22] xprtrdma: Eliminate INLINE_THRESHOLD macros Chuck Lever
2016-08-23 17:52     ` Chuck Lever
2016-08-23 17:52   ` [PATCH v2 02/22] SUNRPC: Refactor rpc_xdr_buf_init() Chuck Lever
2016-08-23 17:52     ` Chuck Lever
     [not found]     ` <20160823175219.13038.22735.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org>
2016-08-26 21:05       ` Anna Schumaker
2016-08-26 21:05         ` Anna Schumaker
2016-08-23 17:52   ` [PATCH v2 03/22] SUNRPC: Generalize the RPC buffer allocation API Chuck Lever
2016-08-23 17:52     ` Chuck Lever
2016-08-23 17:52   ` [PATCH v2 04/22] SUNRPC: Generalize the RPC buffer release API Chuck Lever
2016-08-23 17:52     ` Chuck Lever
2016-08-23 17:52   ` [PATCH v2 05/22] SUNRPC: Separate buffer pointers for RPC Call and Reply messages Chuck Lever
2016-08-23 17:52     ` Chuck Lever
     [not found]     ` <20160823175244.13038.39619.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org>
2016-08-29 14:23       ` Anna Schumaker
2016-08-29 14:23         ` Anna Schumaker
     [not found]         ` <1e9440d8-111a-4252-c706-2e3c26f7b09a-ZwjVKphTwtPQT0dZR+AlfA@public.gmane.org>
2016-08-29 15:33           ` Chuck Lever
2016-08-29 15:33             ` Chuck Lever
     [not found]             ` <10EFE631-06F6-4E4E-9EBC-F7ABFDF2C742-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2016-08-29 15:44               ` Anna Schumaker
2016-08-29 15:44                 ` Anna Schumaker
2016-08-23 17:52   ` [PATCH v2 06/22] SUNRPC: Add a transport-specific private field in rpc_rqst Chuck Lever
2016-08-23 17:52     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 07/22] xprtrdma: Initialize separate RPC call and reply buffers Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 08/22] xprtrdma: Use smaller buffers for RPC-over-RDMA headers Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 09/22] xprtrdma: Replace DMA_BIDIRECTIONAL Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 10/22] xprtrdma: Delay DMA mapping Send and Receive buffers Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 11/22] xprtrdma: Eliminate "ia" argument in rpcrdma_{alloc, free}_regbuf Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 12/22] xprtrdma: Simplify rpcrdma_ep_post_recv() Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 13/22] xprtrdma: Move send_wr to struct rpcrdma_req Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:53   ` [PATCH v2 14/22] xprtrdma: Move recv_wr to struct rpcrdma_rep Chuck Lever
2016-08-23 17:53     ` Chuck Lever
2016-08-23 17:54   ` [PATCH v2 15/22] rpcrdma: RDMA/CM private message data structure Chuck Lever
2016-08-23 17:54     ` Chuck Lever
2016-08-23 17:54   ` [PATCH v2 16/22] xprtrdma: Client-side support for rpcrdma_connect_private Chuck Lever
2016-08-23 17:54     ` Chuck Lever
2016-08-23 17:54   ` [PATCH v2 17/22] xprtrdma: Basic support for Remote Invalidation Chuck Lever
2016-08-23 17:54     ` Chuck Lever
2016-08-23 17:54   ` [PATCH v2 18/22] xprtrdma: Use gathered Send for large inline messages Chuck Lever
2016-08-23 17:54     ` Chuck Lever
2016-08-23 17:54   ` [PATCH v2 19/22] xprtrdma: Support larger inline thresholds Chuck Lever
2016-08-23 17:54     ` Chuck Lever
     [not found]     ` <20160823175438.13038.1624.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org>
2016-08-29 19:52       ` Anna Schumaker
2016-08-29 19:52         ` Anna Schumaker
     [not found]         ` <c922120b-35f3-65bf-e778-3cef645cee48-ZwjVKphTwtPQT0dZR+AlfA@public.gmane.org>
2016-08-29 20:02           ` Chuck Lever [this message]
2016-08-29 20:02             ` Chuck Lever
2016-08-23 17:54   ` [PATCH v2 20/22] xprtrmda: Report address of frmr, not mw Chuck Lever
2016-08-23 17:54     ` Chuck Lever
     [not found]     ` <20160823175446.13038.58792.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org>
2016-08-29 19:54       ` Anna Schumaker
2016-08-29 19:54         ` Anna Schumaker
     [not found]         ` <7f92664a-a16c-6c44-b8f8-391e4fec0a89-ZwjVKphTwtPQT0dZR+AlfA@public.gmane.org>
2016-08-29 20:13           ` Chuck Lever
2016-08-29 20:13             ` Chuck Lever
2016-08-23 17:54   ` [PATCH v2 21/22] xprtrdma: Rename rpcrdma_receive_wc() Chuck Lever
2016-08-23 17:54     ` Chuck Lever
2016-08-23 17:55   ` [PATCH v2 22/22] xprtrdma: Eliminate rpcrdma_receive_worker() Chuck Lever
2016-08-23 17:55     ` Chuck Lever

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