From: Ralf Baechle <ralf@linux-mips.org>
To: Michael Uhler <uhler@mips.com>
Cc: "'Matej Kupljen'" <matej.kupljen@ultra.si>,
"'Maciej W. Rozycki'" <macro@linux-mips.org>,
"'Daniel Jacobowitz'" <dan@debian.org>,
linux-mips@linux-mips.org
Subject: Re: [PATCH] Fix TCP/UDP checksums on the Broadcom SB-1
Date: Tue, 20 Sep 2005 15:59:48 +0100 [thread overview]
Message-ID: <20050920145948.GF3159@linux-mips.org> (raw)
In-Reply-To: <00da01c5bdef$596ee380$0502a8c0@MIPS.COM>
On Tue, Sep 20, 2005 at 07:26:54AM -0700, Michael Uhler wrote:
> For what it's worth, the 64-bit architecture, both prior to and with MIPS64,
> has always required that 64-bit GPRs be sign-extended when used with 32-bit
> operations. I'm surprised that this wasn't seen on more 64-bit CPUs than
> just the SB1.
Usually resends will paper over this kind of problem. It's only a question
of time until they succeed for any protocol that changed the packet
content sufficiently to make the checksum work eventually. But of course
performance will suffer and as a matter of statistics certain IP address
and port ranges are going to suffer more than others.
Ralf
next prev parent reply other threads:[~2005-09-20 15:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-20 3:28 [PATCH] Fix TCP/UDP checksums on the Broadcom SB-1 Daniel Jacobowitz
2005-09-20 10:43 ` Maciej W. Rozycki
2005-09-20 11:00 ` Matej Kupljen
2005-09-20 11:06 ` Ralf Baechle
2005-09-20 14:26 ` Michael Uhler
2005-09-20 14:26 ` Michael Uhler
2005-09-20 14:59 ` Ralf Baechle [this message]
2005-09-20 11:01 ` Ralf Baechle
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