Date: Mon, 01 Jun 2009 10:13:09 +0200 From: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de> To: Attilio Rao <attilio@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64 Message-ID: <4A238D95.9020209@mail.zedat.fu-berlin.de> In-Reply-To: <3bbf2fe10905300951o3beea201j72b6e6b96f85c05a@mail.gmail.com> References: <4A2120D5.50300@mail.zedat.fu-berlin.de> <3bbf2fe10905300848s6342a7b1l32340baee8e7e8f1@mail.gmail.com> <4A215D7F.7020807@mail.zedat.fu-berlin.de> <3bbf2fe10905300944r96ae931re4475c78d9be3aa8@mail.gmail.com> <3bbf2fe10905300951o3beea201j72b6e6b96f85c05a@mail.gmail.com>
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Attilio Rao wrote: > 2009/5/30 Attilio Rao <attilio@freebsd.org>: > >> 2009/5/30 O. Hartmann <ohartman@mail.zedat.fu-berlin.de>: >> >>> Attilio Rao wrote: >>> >>>> 2009/5/30 O. Hartmann <ohartman@mail.zedat.fu-berlin.de>: >>>> >>>> >>>>> Hello. >>>>> I realized a significant slowdown of FreeBSD 8.0-CURRENT/amd64 on every >>>>> box I run. I have the most recent FreeBSD 8.0-CURRENT/amd64 with custom >>>>> kernel and switched off every debugging. I see a drastic slowdown >>>>> whenever heavy I/O on UFS2 and ZFS partitions is performed and whenever >>>>> some compilation is done (compiling world and kernel). This is horrible >>>>> on a single core Athlon64 CPU with 2GB RAM as well as on a 4 core Q6600 >>>>> with 8GB and a server with 2 x 4-cores and 16GB RAM. >>>>> >>>>> I can not say clearly whether I/O is the bottleneck. Maybe something >>>>> with the memory subsystem, when it comes to compiler runs, when no disk >>>>> I/O is done but the box is still horrible slow. This behaviour occured >>>>> several weeks ago, not being able to specify it more precisely. >>>>> >>>>> AQre there any issues at the moment? >>>>> >>>>> >>>> Your kernel is compiled from which date? >>>> >>>> Thanks, >>>> Attilio >>>> >>>> >>>> >>>> >>> Most recent, say: yesterday! As well as world. >>> >> Can you try to revert only r193011 and see if something changes? >> > > Also, did you compile the single-core athlon64 without the option SMP? > > Thanks, > Attilio > > > Yes, I did of course compile kernel on UP without option SMP and of those with more than on logical core with SMP on. I will try to revert to r193011. Oliver
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