From: Ingo Molnar <mingo@kernel.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Neil Horman <nhorman@tuxdriver.com>,
linux-kernel@vger.kernel.org, sebastien.dugue@bull.net,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org
Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's
Date: Mon, 14 Oct 2013 09:49:00 +0200 [thread overview]
Message-ID: <20131014074900.GA20095@gmail.com> (raw)
In-Reply-To: <87siw4xy9i.fsf@tassilo.jf.intel.com>
* Andi Kleen <andi@firstfloor.org> wrote:
> Neil Horman <nhorman@tuxdriver.com> writes:
>
> > Sébastien Dugué reported to me that devices implementing ipoib (which
> > don't have checksum offload hardware were spending a significant
> > amount of time computing
>
> Must be an odd workload, most TCP/UDP workloads do copy-checksum
> anyways. I would rather investigate why that doesn't work.
There's a fair amount of csum_partial()-only workloads, a packet does not
need to hit user-space to be a significant portion of the system's
workload.
That said, it would indeed be nice to hear which particular code path was
hit in this case, if nothing else then for education purposes.
Thanks,
Ingo
next prev parent reply other threads:[~2013-10-14 7:49 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-11 16:51 [PATCH] x86: Run checksumming in parallel accross multiple alu's Neil Horman
2013-10-12 17:21 ` Ingo Molnar
2013-10-13 12:53 ` Neil Horman
2013-10-14 20:28 ` Neil Horman
2013-10-14 21:19 ` Eric Dumazet
2013-10-14 22:18 ` Eric Dumazet
2013-10-14 22:37 ` Joe Perches
2013-10-14 22:44 ` Eric Dumazet
2013-10-14 22:49 ` Joe Perches
2013-10-15 7:41 ` Ingo Molnar
2013-10-15 10:51 ` Borislav Petkov
2013-10-15 12:04 ` Ingo Molnar
2013-10-15 16:21 ` Joe Perches
2013-10-16 0:34 ` Eric Dumazet
2013-10-16 6:25 ` Ingo Molnar
2013-10-16 16:55 ` Joe Perches
2013-10-17 0:34 ` Neil Horman
2013-10-17 1:42 ` Eric Dumazet
2013-10-18 16:50 ` Neil Horman
2013-10-18 17:20 ` Eric Dumazet
2013-10-18 20:11 ` Neil Horman
2013-10-18 21:15 ` Eric Dumazet
2013-10-20 21:29 ` Neil Horman
2013-10-21 17:31 ` Eric Dumazet
2013-10-21 17:46 ` Neil Horman
2013-10-21 19:21 ` Neil Horman
2013-10-21 19:44 ` Eric Dumazet
2013-10-21 20:19 ` Neil Horman
2013-10-26 12:01 ` Ingo Molnar
2013-10-26 13:58 ` Neil Horman
2013-10-27 7:26 ` Ingo Molnar
2013-10-27 17:05 ` Neil Horman
2013-10-17 8:41 ` Ingo Molnar
2013-10-17 18:19 ` H. Peter Anvin
2013-10-17 18:48 ` Eric Dumazet
2013-10-18 6:43 ` Ingo Molnar
2013-10-28 16:01 ` Neil Horman
2013-10-28 16:20 ` Ingo Molnar
2013-10-28 17:49 ` Neil Horman
2013-10-28 16:24 ` Ingo Molnar
2013-10-28 16:49 ` David Ahern
2013-10-28 17:46 ` Neil Horman
2013-10-28 18:29 ` Neil Horman
2013-10-29 8:25 ` Ingo Molnar
2013-10-29 11:20 ` Neil Horman
2013-10-29 11:30 ` Ingo Molnar
2013-10-29 11:49 ` Neil Horman
2013-10-29 12:52 ` Ingo Molnar
2013-10-29 13:07 ` Neil Horman
2013-10-29 13:11 ` Ingo Molnar
2013-10-29 13:20 ` Neil Horman
2013-10-29 14:17 ` Neil Horman
2013-10-29 14:27 ` Ingo Molnar
2013-10-29 20:26 ` Neil Horman
2013-10-31 10:22 ` Ingo Molnar
2013-10-31 14:33 ` Neil Horman
2013-11-01 9:13 ` Ingo Molnar
2013-11-01 14:06 ` Neil Horman
2013-10-29 14:12 ` David Ahern
2013-10-15 7:32 ` Ingo Molnar
2013-10-15 13:14 ` Neil Horman
2013-10-12 22:29 ` H. Peter Anvin
2013-10-13 12:53 ` Neil Horman
2013-10-18 16:42 ` Neil Horman
2013-10-18 17:09 ` H. Peter Anvin
2013-10-25 13:06 ` Neil Horman
2013-10-14 4:38 ` Andi Kleen
2013-10-14 7:49 ` Ingo Molnar [this message]
2013-10-14 21:07 ` Eric Dumazet
2013-10-15 13:17 ` Neil Horman
2013-10-14 20:25 ` Neil Horman
2013-10-15 7:12 ` Sébastien Dugué
2013-10-15 13:33 ` Andi Kleen
2013-10-15 13:56 ` Sébastien Dugué
2013-10-15 14:06 ` Eric Dumazet
2013-10-15 14:15 ` Sébastien Dugué
2013-10-15 14:26 ` Eric Dumazet
2013-10-15 14:52 ` Eric Dumazet
2013-10-15 16:02 ` Andi Kleen
2013-10-16 0:28 ` Eric Dumazet
2013-11-06 15:23 ` x86: Enhance perf checksum profiling and x86 implementation Neil Horman
2013-11-06 15:23 ` [PATCH v2 1/2] perf: Add csum benchmark tests to perf Neil Horman
2013-11-06 15:23 ` [PATCH v2 2/2] x86: add prefetching to do_csum Neil Horman
2013-11-06 15:34 ` Dave Jones
2013-11-06 15:54 ` Neil Horman
2013-11-06 17:19 ` Joe Perches
2013-11-06 18:11 ` Neil Horman
2013-11-06 20:02 ` Neil Horman
2013-11-06 20:07 ` Joe Perches
2013-11-08 16:25 ` Neil Horman
2013-11-08 16:51 ` Joe Perches
2013-11-08 19:07 ` Neil Horman
2013-11-08 19:17 ` Joe Perches
2013-11-08 20:08 ` Neil Horman
2013-11-08 19:17 ` H. Peter Anvin
2013-11-08 19:01 ` Neil Horman
2013-11-08 19:33 ` Joe Perches
2013-11-08 20:14 ` Neil Horman
2013-11-08 20:29 ` Joe Perches
2013-11-11 19:40 ` Neil Horman
2013-11-11 21:18 ` Ingo Molnar
2013-11-06 18:23 ` Eric Dumazet
2013-11-06 18:59 ` Neil Horman
2013-11-06 20:19 ` Andi Kleen
2013-11-07 21:23 ` Neil Horman
-- strict thread matches above, loose matches on Subject: below --
2013-10-18 15:46 [PATCH] x86: Run checksumming in parallel accross multiple alu's Doug Ledford
2013-10-18 17:42 Doug Ledford
2013-10-19 8:23 ` Ingo Molnar
2013-10-21 17:54 ` Doug Ledford
2013-10-26 11:55 ` Ingo Molnar
2013-10-28 17:02 ` Doug Ledford
2013-10-29 8:38 ` Ingo Molnar
2013-10-30 5:25 Doug Ledford
2013-10-30 10:27 ` David Laight
2013-10-30 11:02 ` Neil Horman
2013-10-30 12:18 ` David Laight
2013-10-30 13:22 ` Doug Ledford
2013-10-30 13:35 ` Doug Ledford
2013-10-30 14:04 ` David Laight
2013-10-30 14:52 ` Neil Horman
2013-10-31 18:30 ` Neil Horman
2013-11-01 9:21 ` Ingo Molnar
2013-11-01 15:42 ` Ben Hutchings
2013-11-01 16:08 ` Neil Horman
2013-11-01 16:16 ` Ben Hutchings
2013-11-01 16:18 ` David Laight
2013-11-01 17:37 ` Neil Horman
2013-11-01 19:45 ` Joe Perches
2013-11-01 19:58 ` Neil Horman
2013-11-01 20:26 ` Joe Perches
2013-11-02 2:07 ` Neil Horman
2013-11-04 9:47 ` David Laight
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=20131014074900.GA20095@gmail.com \
--to=mingo@kernel.org \
--cc=andi@firstfloor.org \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=nhorman@tuxdriver.com \
--cc=sebastien.dugue@bull.net \
--cc=tglx@linutronix.de \
--cc=x86@kernel.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).