From: David S. Miller Date: Wed, 20 Apr 2005 18:07:20 GMT Subject: Re: [PATCH] write-tree performance problems Message-ID: <20050420110720.0ff887b4.davem@davemloft.net> In-Reply-To: On Wed, 20 Apr 2005 10:06:15 -0700 (PDT) Linus Torvalds wrote: > I bet your SHA1 implementation is done with hand-optimized and scheduled > x86 MMX code or something, while my poor G5 is probably using some slow > generic routine. As a result, it only improved by 33% for me since the > compression was just part of the picture, but with your cheap SHA1 the > compression costs really dominated, and so it's almost four times faster > for you. The openssl tree has a i586 optimized SHA1 implementation. A quick scan of the 0.9.7e tree I happen to have lying around shows there aren't optimized for other cpus in there, just i586.