Date: Thu, 10 Dec 1998 11:31:55 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Bruce Evans <bde@zeta.org.au> Cc: freebsd-current@FreeBSD.ORG Subject: Re: increased UDP latencies in -current Message-ID: <13935.62856.525786.504663@grasshopper.cs.duke.edu> In-Reply-To: <199812101613.DAA16454@godzilla.zeta.org.au> References: <199812101613.DAA16454@godzilla.zeta.org.au>
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Bruce Evans writes: > >In the process of doing some Myrinet benchmarks, I noticed that UDP > >latencies have increased markedly after upgrading from 2.2.5-stable to > >3.0-current. > > I see the opposite of this, if anything, for -current vs 2.2.6-2.2.7. Hmm.. Perhaps my 2.2.5 kernel was built before the change responsible for the increased latencies was committed. < .. > > > On a K6/233, VIA2 chipset: > lmbench-1.x "lat_udp localhost" > -------- > 2.2.5-2.2.6 about 85 > -current about 80 lmbench 1-x shows similar results to what I saw with hbench: 2.2.5 54 -current 65 > Other not very careful lmbench-2 tests show a 10% UDP time bloat in my > version of -current over the last 18 months: > > *Local* Communication latencies in microseconds - smaller is better > ------------------------------------------------------------------- > Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP > ctxsw UNIX UDP TCP conn > --------- ------------- ----- ----- ---- ----- ----- ----- ----- ---- > gamplex.b FreeBSD 2.2.6 9 34 41 85 155 91 199 351 > gamplex.b FreeBSD 3.0-C 14 30 32 71 161 79 202 575 > gamplex.b FreeBSD 3.0-C 13 28 31 70 75 190 653 > gamplex.b FreeBSD 3.0-C 7 26 33 79 91 207 > gamplex.b FreeBSD 3.0-C 7 27 34 74 83 209 > gamplex.b FreeBSD 3.0-C 7 29 34 78 85 207 > gamplex.b FreeBSD 3.0-C 7 26 35 85 80 211 > gamplex.b FreeBSD 3.0-C 8 27 35 88 79 > gamplex.b FreeBSD 3.0-C 5 25 36 75 161 77 217 > gamplex.b FreeBSD 3.0-C 7 27 36 82 176 85 216 > gamplex.b FreeBSD 3.0-C 6 27 35 80 82 210 > gamplex.b Linux 2.1.128 6 28 52 74 169 92 222 What are the differences between the many 'FreeBSD 3.0-C' entries? Is it is primarily the date their kernel sources were checked out? Do you have approximate dates? Thanks, Drew ------------------------------------------------------------------------------ Andrew Gallatin, Sr Systems Programmer http://www.cs.duke.edu/~gallatin Duke University Email: gallatin@cs.duke.edu Department of Computer Science Phone: (919) 660-6590 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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