From: Tom Talpey <tom-CLs1Zie5N5HQT0dZR+AlfA@public.gmane.org>
To: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH RFC 2/3] svcrdma: Use device rdma_read_access_flags
Date: Tue, 10 Nov 2015 10:16:34 -0500 [thread overview]
Message-ID: <56420A52.1080309@talpey.com> (raw)
In-Reply-To: <F60E8BA6-D728-44E4-9331-0C23AB96E634-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
On 11/10/2015 9:34 AM, Chuck Lever wrote:
> 2. Is there a reason IB is not using the allphys MR for RDMA Read?
> That would be much more efficient. On the NFS server that MR isn't
> exposed, thus it is safe to use.
True, but only if the layout of the buffer's physical pages do not
exceed the local RDMA Read scatter limit. If the size is large then
the privileged MR will require additional RDMA Read operations, which
can be more expensive. It's certainly a valid optimization, if the
buffer "fits".
--
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
next prev parent reply other threads:[~2015-11-10 15:16 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-10 10:44 [PATCH RFC 0/3] Introduce device attribute rdma_read_access_flags Sagi Grimberg
[not found] ` <1447152255-28231-1-git-send-email-sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-11-10 10:44 ` [PATCH RFC 1/3] IB/core: Expose a device attribute for rdma_read access flags Sagi Grimberg
[not found] ` <1447152255-28231-2-git-send-email-sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-11-10 11:25 ` Christoph Hellwig
[not found] ` <20151110112537.GA8991-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 11:36 ` Sagi Grimberg
2015-11-10 11:51 ` Yann Droneaud
[not found] ` <1447156270.7089.3.camel-RlY5vtjFyJ3QT0dZR+AlfA@public.gmane.org>
2015-11-10 12:28 ` Sagi Grimberg
[not found] ` <5641E2D1.8070209-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-10 12:39 ` Sagi Grimberg
2015-11-10 12:36 ` Tom Talpey
[not found] ` <5641E4C9.7000206-CLs1Zie5N5HQT0dZR+AlfA@public.gmane.org>
2015-11-10 12:42 ` Sagi Grimberg
[not found] ` <5641E644.7080101-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-11-10 13:06 ` Christoph Hellwig
[not found] ` <20151110130648.GA10682-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 13:41 ` Christoph Hellwig
[not found] ` <20151110134147.GA12814-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 18:36 ` Jason Gunthorpe
[not found] ` <20151110183627.GJ12667-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-11-11 8:03 ` Christoph Hellwig
2015-11-11 9:07 ` Sagi Grimberg
[not found] ` <56430542.5090008-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-11 10:25 ` Christoph Hellwig
2015-11-10 18:06 ` Jason Gunthorpe
2015-11-10 18:01 ` Jason Gunthorpe
[not found] ` <20151110180156.GE12667-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-11-11 8:08 ` Christoph Hellwig
[not found] ` <20151111080837.GA14662-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-11 9:09 ` Sagi Grimberg
[not found] ` <564305AF.3020903-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-11 10:26 ` Christoph Hellwig
2015-11-10 10:44 ` [PATCH RFC 2/3] svcrdma: Use device rdma_read_access_flags Sagi Grimberg
[not found] ` <1447152255-28231-3-git-send-email-sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-11-10 11:38 ` Christoph Hellwig
[not found] ` <20151110113839.GA32523-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 11:42 ` Sagi Grimberg
2015-11-10 17:03 ` Chuck Lever
2015-11-10 11:41 ` Christoph Hellwig
[not found] ` <20151110114145.GA2810-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 11:46 ` Sagi Grimberg
[not found] ` <5641D920.5000409-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-11-10 12:04 ` Christoph Hellwig
[not found] ` <20151110120432.GA8230-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 14:34 ` Chuck Lever
[not found] ` <F60E8BA6-D728-44E4-9331-0C23AB96E634-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2015-11-10 15:16 ` Tom Talpey [this message]
2015-11-10 18:25 ` Jason Gunthorpe
[not found] ` <20151110182546.GI12667-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-11-10 21:00 ` Tom Talpey
[not found] ` <56425AFB.30202-CLs1Zie5N5HQT0dZR+AlfA@public.gmane.org>
2015-11-10 21:17 ` Jason Gunthorpe
[not found] ` <20151110211716.GA21631-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-11-10 21:30 ` Tom Talpey
[not found] ` <564261EF.4000008-CLs1Zie5N5HQT0dZR+AlfA@public.gmane.org>
2015-11-10 23:01 ` Chuck Lever
[not found] ` <54CF0111-E9C4-4196-BF92-7E134A6A329A-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2015-11-10 23:55 ` Jason Gunthorpe
[not found] ` <20151110235551.GA12795-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2015-11-11 8:07 ` Christoph Hellwig
2015-11-11 9:28 ` Sagi Grimberg
[not found] ` <56430A20.6040600-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-11 16:19 ` Chuck Lever
[not found] ` <D4228973-6DFA-4181-9848-41BFE8E75200-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2015-11-11 16:29 ` Sagi Grimberg
[not found] ` <56436CDB.6090305-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-11 20:50 ` Chuck Lever
2015-11-11 9:25 ` Sagi Grimberg
[not found] ` <56430972.8080703-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-11-11 17:39 ` Jason Gunthorpe
2015-11-11 8:02 ` Christoph Hellwig
[not found] ` <20151111080225.GA31508-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-11 17:23 ` Jason Gunthorpe
2015-11-10 16:12 ` Steve Wise
2015-11-10 10:44 ` [PATCH RFC 3/3] RDS_IW: " Sagi Grimberg
[not found] ` <1447152255-28231-4-git-send-email-sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-11-10 11:26 ` Christoph Hellwig
[not found] ` <20151110112638.GB8991-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 11:35 ` Sagi Grimberg
2015-11-10 11:31 ` [PATCH RFC 0/3] Introduce device attribute rdma_read_access_flags Christoph Hellwig
[not found] ` <20151110113141.GA23093-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2015-11-10 11:40 ` Sagi Grimberg
2015-11-10 16:18 ` Steve Wise
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=56420A52.1080309@talpey.com \
--to=tom-cls1zie5n5hqt0dzr+alfa@public.gmane.org \
--cc=chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org \
--cc=hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org \
--cc=linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).