Date: Mon, 17 Mar 2003 11:41:13 -0800 From: "John Stockdale" <jstockdale@stanford.edu> To: <freebsd-current@FreeBSD.ORG> Subject: RE: mdconfig/mdmfs problems -> kernel panic Message-ID: <001b01c2ecbd$2ae65f30$3d2c0c80@quenya> In-Reply-To: <30786.1047929196@critter.freebsd.dk>
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Ahh, that explains why the multiple /dev/md* didn't help the problem.
I'm looking into the vmstat options, but can't figure out how to extract
the malloc-per-bucket-quota limit for the system (I've read man vmstat,
and tried vmstat -z and vmstat -m, but the only "Limit" listed is under
vmstat -z, and nothing indicates if any displayed limits are relavent to
this discussion). Additionally, if I am hitting this limit, how can I
increase the limit/what kind of impact would increasing the impact have
on the system except in allowing me to user larger /dev/md*?
Thanks.
-John
-----Original Message-----
From: Poul-Henning Kamp [mailto:phk@phk.freebsd.dk]
Sent: Monday, March 17, 2003 11:27 AM
To: John Stockdale
Cc: freebsd-current@FreeBSD.ORG
Subject: Re: mdconfig/mdmfs problems -> kernel panic
In message <000b01c2ecb7$1c089510$3d2c0c80@quenya>, "John Stockdale"
writes:
>OS: FreeBSD 5.0-CURRENT, JPSNAP20030314
>
>I'm running a Dual Xeon system with 1GB DDRRAM, and trying to create a
>ram disk to compile under, specifically to compile the kernel.
>
>I've tried several methods, involving either creating one 512MB disk
>with mdconfig or mdmfs. No matter what options I specify, the mounted
>mfs works fine until I start filling it up more. For instance, I can
>usually copy the entire /usr/src/sys to /mnt and make depend, but a
>while after I make the kernel panics as a result of the ram disk.
>(specifically citing malloc errors, one time it speicifically spat out
>a number in the order of 251XXXXXX and indicated a malloc bucket limit
>exceeded or something like that)
quote 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).
--
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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