From: Patrick McManus <mcmanus@ducksong.com>
To: "Brandeburg, Jesse" <jesse.brandeburg@intel.com>
Cc: netdev@vger.kernel.org
Subject: RE: 2.6.27 problem with shaping using netem/ifb (regression?) [TSO]
Date: Wed, 01 Oct 2008 21:55:42 -0400 [thread overview]
Message-ID: <1222912542.6395.30.camel@tng> (raw)
In-Reply-To: <36D9DB17C6DE9E40B059440DB8D95F52064FB007@orsmsx418.amr.corp.intel.com>
On Wed, 2008-10-01 at 18:42 -0700, Brandeburg, Jesse wrote:
> > Any thoughts on where to look? I hope attaching the script is helpful
> -
> > it is pretty self evident when running it if things are working ok.
> > This
> > is all on amd64 if that is relevant.
>
> Have you tried disabling TSO and/or GSO on the loopback device?
for some reason with loopback that didn't come to mind. It's a good
suggestion, and indeed is the crux of the problem. Thanks!
Disabling TSO (ethtool -K lo tso off) fixes the problem. GSO has no
impact.
probly not relevant, but worth noting - the scripts also set the MTU of
lo to 1500 down from the default 16436
next prev parent reply other threads:[~2008-10-02 1:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-01 23:04 2.6.27 problem with shaping using netem/ifb (regression?) Patrick McManus
2008-10-02 1:42 ` Brandeburg, Jesse
2008-10-02 1:55 ` Patrick McManus [this message]
2008-10-02 15:49 ` 2.6.27 problem with shaping using netem/ifb (regression?) [TSO] Patrick McManus
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=1222912542.6395.30.camel@tng \
--to=mcmanus@ducksong.com \
--cc=jesse.brandeburg@intel.com \
--cc=netdev@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;
as well as URLs for NNTP newsgroup(s).