Date: Mon, 07 Jan 2002 12:26:30 -0800 From: Michael Smith <msmith@freebsd.org> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Dan Moschuk <dan@freebsd.org>, stable@freebsd.org Subject: Re: Hang in md driver Message-ID: <200201072026.g07KQUX01267@mass.dis.org> In-Reply-To: Your message of "Mon, 07 Jan 2002 20:22:36 %2B0100." <99902.1010431356@critter.freebsd.dk>
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This doesn't seem to address the problem; md(4) shouldn't hang when it runs out of memory. > >From md(4): > > malloc Backing store is allocated using malloc(9). Only one malloc- > bucket is used, which means that all md devices with malloc > backing must share the malloc-per-bucket-quota. The exact size > of this quota varies, in particular with the amount of RAM in > the system. The exact value can be determined with vmstat(8). > > > In message <20020107141157.A1759@spirit.jaded.net>, Dan Moschuk writes: > > > >I can reproduce a hang in the md driver reliably. > > > >Setup: > > > >dd if=/dev/zero of=image bs=32k count=8k > >vnconfig -s labels -c vn0 image > >diskabel -r -w vn0 auto > >newfs vn0c > > > >dd if=image of=/dev/md0 bs=32k count=8k > >mount /dev/md0c /mnt > > > >This works as expected. > > > >If I run bonnie against /mnt with a 64M filesize, everything is fine. > >However, once I up that size to 128M it will hang half way through. > > > >Using an mfs partition instead yields no problems. > > > >I've tested this against a 4.3 (512M ram) and a 4.4 (1.5GB ram) boxes > >respectively and both are affected. top says the bonnie process is in the > >"MD sec" state. > > > >Cheers, > >-Dan > > > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > phk@FreeBSD.ORG | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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