From: Eric Dumazet <eric.dumazet@gmail.com>
To: Alex Dubov <oakad@yahoo.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>,
netdev@vger.kernel.org, David Miller <davem@davemloft.net>
Subject: Re: Bad TCP timestamps on non-PC platforms
Date: Mon, 10 Jan 2011 08:07:56 +0100 [thread overview]
Message-ID: <1294643276.2709.877.camel@edumazet-laptop> (raw)
In-Reply-To: <373539.88491.qm@web37603.mail.mud.yahoo.com>
Le dimanche 09 janvier 2011 à 22:33 -0800, Alex Dubov a écrit :
> > > Any ideas where this particular problem may
> > originate?
> >
> > Is there a bug in checksum offload in the driver?
> > Does the hardware correctly handle checksum of packets that
> > are
> > unaligned or whose length is an odd number of bytes?
> >
> > If the hardware can't do checksum correctly, the driver
> > should either
> > disable checksum offload or in worst case copy the packet
> > to a new
> > buffer that is in a known safe place.
>
> I managed to work around the issue by clearing the NETIF_F_IP_CSUM
> feature flag of the gianfar network driver, so it appears the bug is
> indeed somewhere there.
>
Its incredible how TCP timestamps can be "usual suspects" ;)
next prev parent reply other threads:[~2011-01-10 7:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-10 3:41 Bad TCP timestamps on non-PC platforms Alex Dubov
2011-01-10 3:57 ` Stephen Hemminger
2011-01-10 6:33 ` Alex Dubov
2011-01-10 7:07 ` Eric Dumazet [this message]
2011-01-10 7:19 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2011-01-06 6:55 Alex Dubov
2011-01-06 8:09 ` Eric Dumazet
2011-01-07 1:55 ` Alex Dubov
2011-01-07 2:11 ` Eric Dumazet
2011-01-07 6:39 ` Alex Dubov
2011-01-06 16:44 ` David Miller
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=1294643276.2709.877.camel@edumazet-laptop \
--to=eric.dumazet@gmail.com \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
--cc=oakad@yahoo.com \
--cc=shemminger@vyatta.com \
/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