Date: Wed, 28 Jan 2004 17:36:21 +0000 From: Colin Percival <colin.percival@wadham.ox.ac.uk> To: Don Bowman <don@sandvine.com> Cc: "'freebsd-current@freebsd.org'" <freebsd-current@freebsd.org> Subject: Re: system call performance 4.x vs 5.x [and UP vs MP] Message-ID: <6.0.1.1.1.20040128173146.03f29ad0@imap.sfu.ca> In-Reply-To: <FE045D4D9F7AED4CBFF1B3B813C85337035E46FF@mail.sandvine.com > References: <FE045D4D9F7AED4CBFF1B3B813C85337035E46FF@mail.sandvine.com>
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At 17:20 28/01/2004, Don Bowman wrote: >For example, on a 2.0GHz P4-Xeon, HTT enabled, MP kernel, i can >do ~1M socket/s calls on 4.7, but only ~250K/s on 5.2. > > syscall 4.7 5.2 > write 1015036 169800 > socket 1078994 223253 > select 430564 155077 >gettimeofday 252762 183620 > >Any suggestion on why such a difference between 4.x and 5.x? Mutexes are slow. The SMP changes in 5.x result in much better scaling, but there is some inevitable overhead cost. Colin Percival
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