From: Grant Grundler <grundler@dsl2.external.hp.com>
To: Jochen Friedrich <jochen@scram.de>
Cc: mike_phillips@urscorp.com, linux-tr@linuxtr.net,
HP900 PARISC mailing list <parisc-linux@lists.parisc-linux.org>,
Randolph Chung <randolph@tausq.org>,
Matthew Wilcox <willy@debian.org>
Subject: Re: [linux-tr] Re: [parisc-linux] IBM TR patch
Date: Wed, 16 Jan 2002 22:01:30 -0700 [thread overview]
Message-ID: <20020117050130.64F98482D@dsl2.external.hp.com> (raw)
In-Reply-To: Message from Jochen Friedrich <jochen@scram.de> of "Tue, 15 Jan 2002 21:28:13 +0100." <Pine.LNX.4.43.0201152120370.11606-100000@alpha.bocc.de>
Jochen Friedrich wrote:
> Hi Mike,
> I guess the pre-summarisation is there for performance reasons. In
> particular on older architectures, it's probably faster to copy and
> calculate the IPv4 checksum in the same step than to copy and checksum in
> two seperate steps.
I believe it's faster on all archs to do this in one loop.
Assuming one has enough registers to do both operations at the same time.
My assumption is anything that can run linux has enough registers.
(ie ld/st does not collide with xor).
grant
next prev parent reply other threads:[~2002-01-17 5:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-15 20:10 [linux-tr] Re: [parisc-linux] IBM TR patch mike_phillips
2002-01-15 20:28 ` Jochen Friedrich
2002-01-17 5:01 ` Grant Grundler [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-01-15 20:10 mike_phillips
2002-01-15 20:32 ` Jochen Friedrich
2002-01-15 21:37 ` Alan Cox
2002-01-19 14:39 drequena
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