From: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>,
Or Gerlitz <or.gerlitz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Sebastian Parschauer
<sebastian.riemer-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>,
David Dillow <dave-i1Mk8JYDVaaSihdK6806/g@public.gmane.org>,
linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH 5/5] IB/srp: Optimize completion queue polling
Date: Tue, 8 Jul 2014 12:24:27 +0300 [thread overview]
Message-ID: <53BBB8CB.2010300@mellanox.com> (raw)
In-Reply-To: <53BBA79A.9000000-HInyCGIudOg@public.gmane.org>
On 08/07/2014 11:11, Bart Van Assche wrote:
> e might each be referring to different concepts here. What you are
> referring to is average response time for QD > 1. What I was referring
> to is average response time for QD = 1. The measurements I ran with fio
> have shown that the response time for QD = 1 is lower when processing
> completions in interrupt context compared to processing interrupts in
> softirq context.
I see, but wait, I had few arguments... among them the fact that the
vast majority if not the entire set of networking drivers live well with
this CS to softirqD over-head also for their ping-ping (~ QD=1) latency
tests and their latency is ~3x small vs block drivers.
Or.
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next prev parent reply other threads:[~2014-07-08 9:24 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-03 13:44 [PATCH 0/5] SRP initiator patches for kernel 3.17 Bart Van Assche
[not found] ` <53B55E55.5040907-HInyCGIudOg@public.gmane.org>
2014-07-03 13:45 ` [PATCH 1/5] scsi_transport_srp: Fix fast_io_fail_tmo=dev_loss_tmo=off behavior Bart Van Assche
2014-07-03 13:46 ` [PATCH 2/5] IB/srp: Fix deadlock between host removal and multipathd Bart Van Assche
2014-07-03 13:47 ` [PATCH 3/5] IB/srp: Fix residual handling Bart Van Assche
[not found] ` <53B55EE0.1050403-HInyCGIudOg@public.gmane.org>
2014-07-03 17:00 ` David Dillow
2014-07-03 13:47 ` [PATCH 4/5] IB/srp: Use P_Key cache for P_Key lookups Bart Van Assche
2014-07-03 13:48 ` [PATCH 5/5] IB/srp: Optimize completion queue polling Bart Van Assche
[not found] ` <53B55F1F.6000704-HInyCGIudOg@public.gmane.org>
2014-07-03 16:46 ` Or Gerlitz
[not found] ` <CAJZOPZ+RPe8B_KhKZ-8-S6g871-EKQSnExZgsZ2Z+bo-9L=P9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-07-04 9:59 ` Bart Van Assche
[not found] ` <53B67B0E.5070004-HInyCGIudOg@public.gmane.org>
2014-07-08 7:55 ` Or Gerlitz
[not found] ` <CAJZOPZJokriDMCAxnoXJo+RTRvtDquSMGpQThp8OoDnHjKU32A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-07-08 8:11 ` Bart Van Assche
[not found] ` <53BBA79A.9000000-HInyCGIudOg@public.gmane.org>
2014-07-08 9:24 ` Or Gerlitz [this message]
2014-07-03 16:53 ` David Dillow
2014-07-03 17:05 ` David Dillow
[not found] ` <1404407103.32754.3.camel-a7a0dvSY7KqLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2014-07-04 10:48 ` Bart Van Assche
[not found] ` <1404501176.16296.18.camel@haswell.thedillows.org>
[not found] ` <1404501176.16296.18.camel-a7a0dvSY7KqLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2014-07-08 13:49 ` Bart Van Assche
[not found] ` <53BBF6E3.3040403-HInyCGIudOg@public.gmane.org>
2014-07-08 14:45 ` Sagi Grimberg
2014-07-09 6:22 ` David Dillow
2014-07-03 13:55 ` [PATCH 0/5] SRP initiator patches for kernel 3.17 James Bottomley
2014-07-03 17:03 ` David Dillow
2014-07-03 14:17 ` Bart Van Assche
[not found] ` <53B565EB.50301-HInyCGIudOg@public.gmane.org>
2014-07-03 14:19 ` Bart Van Assche
2014-07-03 15:06 ` Sagi Grimberg
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