Date: Thu, 8 Aug 2013 09:41:12 -0500 From: Eric van Gyzen <eric@vangyzen.net> To: J David <j.david.lists@gmail.com> Cc: freebsd-stable@freebsd.org, dave@mischler.com Subject: Re: unexpected idprio 31 behavior on 9.2-BETA2 and 9.2-RC1 Message-ID: <5203AE08.30504@vangyzen.net> In-Reply-To: <5203A90D.6020008@vangyzen.net> References: <1375737316.96778.10.camel@firkin.mischler.com> <520116DE.8030305@vangyzen.net> <52013992.4050101@vangyzen.net> <CABXB=RRuEEVeNmyOXP4KabF=9Q31jzxoXMopi1LEqBTE6%2B540A@mail.gmail.com> <5203A90D.6020008@vangyzen.net>
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On 08/08/2013 09:19, Eric van Gyzen wrote: > On 08/06/2013 14:23, J David wrote: >> On Tue, Aug 6, 2013 at 1:59 PM, Eric van Gyzen <eric@vangyzen.net> wrote: >>>> on an otherwise idle amd64 system with 4 CPUs. The first command in the >>>> build.log file: >>>> >>>> rm -rf /usr/obj/home/freebsd/tmp >>>> >>>> took over three minutes. It should have taken about three /seconds/. >>>> >>>> "uptime" reported a load average of around 1.00. >>>> "top" showed no threads (user or kernel) using CPU. >>>> "iostat" showed an average of less than 20 tps on ada0. >>>> "rm" was usually in the RUN state. >> We are looking at something similar. Would you be able to try to >> reproduce it using a kernel with: >> >> nooptions SCHED_ULE >> options SCHED_4BSD >> >> to see if it makes a difference? It seems to, but the problem is >> inconsistent enough that I can't be sure. > The 4BSD scheduler does //not// exhibit this problem. I tested with the > latest releng/9.2 (r254054) and an otherwise GENERIC config. To be thorough, I built a GENERIC kernel at the same rev, and it still exhibits the problem. Eric
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