Date: Sun, 08 Mar 1998 22:15:05 -0700 From: "M. Warner Losh" <imp@village.org> To: Mike Smith <mike@smith.net.au> Cc: Marc Slemko <marcs@znep.com>, hackers@FreeBSD.ORG Subject: Re: kernel wishlist for web server performance Message-ID: <199803090515.WAA04129@pencil-box.village.org> In-Reply-To: Your message of "Sat, 07 Mar 1998 21:54:12 PST." <199803080554.VAA08633@dingo.cdrom.com> References: <199803080554.VAA08633@dingo.cdrom.com>
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In message <199803080554.VAA08633@dingo.cdrom.com> Mike Smith writes: : I appreciate the conceptual niceness of what you're describing, but I : guess I'm not convinced that something like that would be worth the : cruft and effort involved. On most modern systems that I've played with, copy avoidance doesn't really help much at all. bcopy and friends run at about 50-75MB/s, while most networking and/or disk protocols are lucky to get into the 5-10M range (sustained). the copies that you are avoiding don't really hurt much and would be difficult to measure for most applications. I have had great difficulty speeding up a driver that I wrote for Solaris by eliminating some bcopy() calls. They tend not to be all that important for most applications.[*] Warner [*] if you are still running on 25MHz processors in embedded systems or on really slow hardware, this statement is completely bogus... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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