From: Andi Kleen <andi@firstfloor.org>
To: Aaron Porter <atporter@primate.net>
Cc: Andi Kleen <andi@firstfloor.org>, linux-kernel@vger.kernel.org
Subject: Re: miserable performance of 2.6.21 under network load
Date: Tue, 24 Jul 2007 21:13:47 +0200 [thread overview]
Message-ID: <20070724191347.GB359@one.firstfloor.org> (raw)
In-Reply-To: <20070724184908.GD24543@primate.net>
> # opreport -l
> CPU: AMD64 processors, speed 1994.52 MHz (estimated)
> Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit mask of 0x00 (No unit mask) count 100000
> samples % app name symbol name
> 914379 48.8404 vmlinux-2.6.21.5 check_poison_obj
> 341920 18.2632 vmlinux-2.6.21.5 poison_obj
You have slab debugging enabled. That makes everything slow.
It costs you ~66% of your CPU time. Disable it.
-Andi
next prev parent reply other threads:[~2007-07-24 19:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-24 17:25 Aaron Porter
2007-07-24 18:48 ` Andi Kleen
2007-07-24 18:49 ` Aaron Porter
2007-07-24 19:13 ` Jeff Garzik
2007-07-24 19:13 ` Andi Kleen [this message]
2007-07-24 20:41 ` Aaron Porter
2007-07-24 19:22 ` Chris Snook
2007-07-24 19:45 ` David Miller
2007-07-24 18:49 ` Chris Snook
2007-07-24 18:53 ` Aaron Porter
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=20070724191347.GB359@one.firstfloor.org \
--to=andi@firstfloor.org \
--cc=atporter@primate.net \
--cc=linux-kernel@vger.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
all inboxes | Powered by JetHome®