Date: Mon, 07 Jan 2002 20:22:36 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Dan Moschuk <dan@freebsd.org> Cc: stable@freebsd.org Subject: Re: Hang in md driver Message-ID: <99902.1010431356@critter.freebsd.dk> In-Reply-To: Your message of "Mon, 07 Jan 2002 14:11:57 EST." <20020107141157.A1759@spirit.jaded.net>
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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.
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