From: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
To: Shirley Ma <shirley.ma-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
eli-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org
Subject: Re: IB_CQ_VECTOR_LEAST_ATTACHED
Date: Thu, 04 Dec 2014 19:43:21 +0100 [thread overview]
Message-ID: <5480AB49.1080209@acm.org> (raw)
In-Reply-To: <54809030.6090107-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
On 12/04/14 17:47, Shirley Ma wrote:
> What's the history of this patch?
> http://lists.openfabrics.org/pipermail/general/2008-May/050813.html
>
> I am working on multiple QPs workload. And I created a similar approach
> with IB_CQ_VECTOR_LEAST_ATTACHED, which can bring up about 17% small I/O
> performance. I think this CQ_VECTOR loading balance should be maintained
> in provider not the caller. I didn't see this patch was submitted to
> mainline kernel, wonder any reason behind?
My interpretation is that an approach similar to
IB_CQ_VECTOR_LEAST_ATTACHED is useful on single-socket systems but
suboptimal on multi-socket systems. Hence the code for associating CQ
sets with CPU sockets in the SRP initiator. These changes have been
queued for kernel 3.19. See also branch drivers-for-3.19 in git repo
git://git.infradead.org/users/hch/scsi-queue.git.
Bart.
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next prev parent reply other threads:[~2014-12-04 18:43 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-04 16:47 IB_CQ_VECTOR_LEAST_ATTACHED Shirley Ma
[not found] ` <54809030.6090107-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2014-12-04 18:43 ` Bart Van Assche [this message]
[not found] ` <5480AB49.1080209-HInyCGIudOg@public.gmane.org>
2014-12-04 19:41 ` IB_CQ_VECTOR_LEAST_ATTACHED Shirley Ma
[not found] ` <5480B8CE.3080704-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2014-12-07 10:20 ` IB_CQ_VECTOR_LEAST_ATTACHED Sagi Grimberg
[not found] ` <54842A05.9070207-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2014-12-07 12:22 ` IB_CQ_VECTOR_LEAST_ATTACHED Matan Barak
[not found] ` <54844690.4040501-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-12-07 12:59 ` IB_CQ_VECTOR_LEAST_ATTACHED Or Gerlitz
[not found] ` <54844F44.1010604-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-12-07 16:58 ` IB_CQ_VECTOR_LEAST_ATTACHED Matan Barak
[not found] ` <54848724.4020908-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-12-09 20:11 ` IB_CQ_VECTOR_LEAST_ATTACHED Or Gerlitz
2014-12-07 20:08 ` IB_CQ_VECTOR_LEAST_ATTACHED Chuck Lever
[not found] ` <A1DD5C9B-ED0E-42D1-A20C-710C7DAB514B-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2014-12-08 0:46 ` IB_CQ_VECTOR_LEAST_ATTACHED Shirley Ma
2014-12-09 11:29 ` IB_CQ_VECTOR_LEAST_ATTACHED Sagi Grimberg
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