From: Bart Van Assche <Bart.VanAssche-Sjgp3cTcYWE@public.gmane.org>
To: "hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org"
<hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org"
<dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH 2/7] IB/srpt: Cache global L_Key
Date: Mon, 9 Oct 2017 16:57:23 +0000 [thread overview]
Message-ID: <1507568242.2674.7.camel@wdc.com> (raw)
In-Reply-To: <20171008090107.GA17153-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
On Sun, 2017-10-08 at 02:01 -0700, Christoph Hellwig wrote:
> On Fri, Oct 06, 2017 at 02:42:38PM -0700, Bart Van Assche wrote:
> > This patch is a micro-optimization for the hot path.
>
> How much does it buy you on what workload?
Hello Christoph,
Because I assume that the improvement realized by this patch will be smaller
than the measurement error I have not yet tried to measure how much this
patch impacts performance. Yet I think this patch is beneficial because it
touches code in the hot path and because it reduces the number of pointer
indirections in that code path.
Bart.
next prev parent reply other threads:[~2017-10-09 16:57 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-06 21:42 [PATCH 0/7] SRP patches for kernel v4.15 Bart Van Assche
2017-10-06 21:42 ` [PATCH 4/7] IB/srp: Avoid a cable pull can trigger a kernel crash Bart Van Assche
[not found] ` <20171006214243.11296-5-bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
2017-10-08 13:22 ` Leon Romanovsky
2017-10-08 13:22 ` Leon Romanovsky
2017-10-09 17:02 ` Bart Van Assche
2017-10-11 12:36 ` Sagi Grimberg
2017-10-11 12:36 ` Sagi Grimberg
[not found] ` <20171006214243.11296-1-bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
2017-10-06 21:42 ` [PATCH 1/7] IB/srpt: Limit the send and receive queue sizes to what the HCA supports Bart Van Assche
[not found] ` <20171006214243.11296-2-bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
2017-10-11 12:31 ` Sagi Grimberg
2017-10-06 21:42 ` [PATCH 2/7] IB/srpt: Cache global L_Key Bart Van Assche
[not found] ` <20171006214243.11296-3-bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
2017-10-08 9:01 ` Christoph Hellwig
[not found] ` <20171008090107.GA17153-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-10-09 16:57 ` Bart Van Assche [this message]
2017-10-06 21:42 ` [PATCH 3/7] IB/srpt: Change default behavior from using SRQ to not using SRQ Bart Van Assche
[not found] ` <20171006214243.11296-4-bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
2017-10-08 10:03 ` Leon Romanovsky
[not found] ` <20171008100317.GR25829-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-10-09 16:56 ` Doug Ledford
[not found] ` <1507568205.46071.46.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-10-09 17:01 ` Bart Van Assche
[not found] ` <1507568492.2674.11.camel-Sjgp3cTcYWE@public.gmane.org>
2017-10-09 17:12 ` Doug Ledford
2017-10-10 4:14 ` Leon Romanovsky
[not found] ` <20171010041423.GJ1252-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-10-10 14:34 ` Doug Ledford
[not found] ` <9443ec1f-0acd-9fa3-4621-a29085d2c606-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-10-10 15:00 ` Leon Romanovsky
[not found] ` <20171010150018.GC2106-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-10-10 15:13 ` Doug Ledford
[not found] ` <1507648402.46071.53.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-10-10 15:44 ` Leon Romanovsky
[not found] ` <20171010154439.GE2106-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-10-10 16:04 ` Bart Van Assche
[not found] ` <1507651473.2815.20.camel-Sjgp3cTcYWE@public.gmane.org>
2017-10-10 17:04 ` Jason Gunthorpe
[not found] ` <20171010170429.GA21288-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-10-10 17:10 ` Bart Van Assche
[not found] ` <1507655454.2815.43.camel-Sjgp3cTcYWE@public.gmane.org>
2017-10-10 18:01 ` Leon Romanovsky
2017-10-10 16:11 ` Doug Ledford
2017-10-06 21:42 ` [PATCH 5/7] IB/srp: Remove second argument of srp_destroy_qp() Bart Van Assche
[not found] ` <20171006214243.11296-6-bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
2017-10-11 12:36 ` Sagi Grimberg
2017-10-06 21:42 ` [PATCH 6/7] IB/srp: Cache global rkey Bart Van Assche
2017-10-06 21:42 ` [PATCH 7/7] IB/srp: Make CM timeout dependent on subnet timeout Bart Van Assche
[not found] ` <20171006214243.11296-8-bart.vanassche-Sjgp3cTcYWE@public.gmane.org>
2017-10-11 12:38 ` Sagi Grimberg
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