Date: Tue, 21 Aug 2012 23:35:15 +0200 From: Florian Smeets <flo@FreeBSD.org> To: Doug Barton <dougb@FreeBSD.org> Cc: Alexander Motin <mav@FreeBSD.org>, lev@FreeBSD.org, Adrian Chadd <adrian@FreeBSD.org>, current@FreeBSD.org Subject: Re: CURRENT as gateway on not-so-fast hardware: where is a bottlneck? Message-ID: <5033FF13.2090003@FreeBSD.org> In-Reply-To: <5031F636.1020405@FreeBSD.org> References: <157941699.20120815004542@serebryakov.spb.ru> <CAJ-Vmon86-FPs4%2BXXkQXAow1jW465pMM2Sj7ZHi_0_E9VYSFSA@mail.gmail.com> <502AE8B5.9090106@FreeBSD.org> <502B775D.7000101@FreeBSD.org> <5031F636.1020405@FreeBSD.org>
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[-- Attachment #1 --] On 20.08.12 10:32, Doug Barton wrote: > On 08/15/2012 03:18, Alexander Motin wrote: >> >> It is quite pointless to speculate without real info like mentioned >> above KTR_SCHED traces. > > I'm sorry, you're quite wrong about that. In the cases I mentioned, and > in about 2 out of 3 of the cases where users reported problems and I > suggested that they try 4BSD, the results were clear. This obviously > points out that there is a serious problem with ULE, and if I were the > one who was responsible for that code I would be looking at ways of > helping users figure out where the problems are. But that's just me. > >> Main thing I've learned about schedulers, things >> there never work as you expect. There are two many factors are relations >> to predict behavior in every case. > > In the web hosting case that I mentioned, I purposely kept every other > factor consistent; and changed only s/ULE/4BSD/. The results were both > clear and consistent. > Can you please prove that with some actual numbers? I seem to recall you posted something not too long ago but i was unable to find that right now. Also can you tell us what you ran and how. I would really like to reproduce this. Thanks, Florian [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAlAz/xQACgkQapo8P8lCvwmabACgr2kUZ62RJnd8pDTu9hHis8QQ or0An3BkPQSuH6OAHuEfD+IzHw/xN4Sp =mEa1 -----END PGP SIGNATURE-----help
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