Date: Mon, 26 Jun 2006 14:32:26 -0500 From: "Matthew D. Fuller" <fullermd@over-yonder.net> To: Michael Vince <mv@thebeastie.org> Cc: freebsd-stable@freebsd.org, performance@freebsd.org, Nikolas Britton <nikolas.britton@gmail.com>, Sean Bryant <bryants@gmail.com> Subject: Re: Gigabit ethernet very slow. Message-ID: <20060626193226.GF74292@over-yonder.net> In-Reply-To: <449F8736.3080508@thebeastie.org> References: <ef10de9a0606250157jce24553h52e67db7a9f76b03@mail.gmail.com> <f6791cc60606250835p51c966e7xa12fb241c9aaab8d@mail.gmail.com> <ef10de9a0606250930k6b655e2bkb81694905454bf58@mail.gmail.com> <ef10de9a0606251523h4102e782m1fe2403c57c80e57@mail.gmail.com> <449F8736.3080508@thebeastie.org>
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On Mon, Jun 26, 2006 at 05:05:26PM +1000 I heard the voice of Michael Vince, and lo! it spake thus: > > According to pftop (with modulate state rules) I am able to get > about 85megs/sec when I don't have dd running. dd does indeed eats a > fair amount of cpu (40%) on the AMD64 6-stable machine. dd does ridiculously small (512 byte?) read/writes, so it's gotta do a LOT of system calls and a lot of context switching when you don't give it a bigger blocksize. -- Matthew Fuller (MF4839) | fullermd@over-yonder.net Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ On the Internet, nobody can hear you scream.
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