Date: Thu, 26 Feb 2009 17:27:24 +0100 From: "Paul B. Mahol" <onemda@gmail.com> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-stable@freebsd.org Subject: Re: qemu+aio vs C2 Message-ID: <3a142e750902260827w722f110eve23a7bdb07cfbe42@mail.gmail.com> In-Reply-To: <49A6BFD1.6090601@icyb.net.ua> References: <49A6BFD1.6090601@icyb.net.ua>
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On 2/26/09, Andriy Gapon <avg@icyb.net.ua> wrote: > > I see something unusual and surprising for me: if I kldload aio for qemu's > sake > and then actually start qemu, I see that share of C2 in cx_usage is > constantly > dropping and then finally there is "too many short sleeps, backing off to > C1". > > This is on i386 with stable/7 as of r188116. > > I am out of ideas. And qemu guest is? Perhaps you should try changing guest kern.hz sysctl setting. I dont think related comitt got MFC-ed to STABLE. -- Paul
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