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Date:      Thu, 05 Jun 2008 16:00:13 +0200
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-hackers@freebsd.org
Subject:   Re: Is there any way to increase the KVM?
Message-ID:  <g28rhe$32m$1@ger.gmane.org>
In-Reply-To: <20080605062728.GA4278@garage.freebsd.pl>
References:  <6a7033710805302252v43a7b240x66ca3f5e3dd5fda4@mail.gmail.com>	<20080603135308.GC3434@garage.freebsd.pl>	<6a7033710806032317g4dbe8845h26a1196016b9c440@mail.gmail.com>	<86zlq140x0.fsf@ds4.des.no>	<6a7033710806041053g4a5c2fdftd7202b708bff363c@mail.gmail.com> <20080605062728.GA4278@garage.freebsd.pl>

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Pawel Jakub Dawidek wrote:

> If we're comparing who has bigger... :)
>=20
> beast:root:~# zpool list
> NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT=

> tank                    732G    604G    128G    82%  ONLINE     -
>=20
> but:
>=20
> beast:root:~# zfs list | wc -l
>     1932
>=20
> No panics.
>=20
> PS. I'm quite sure the ZFS version I've in perforce will fix most if no=
t
> all 'kmem_map too small' panics. It's not yet committed, but I do want
> to MFC it into RELENG_7.

At the risk of sounding repetitive, can you try a simple test on your
ZFS pools, to see if you can panic the kernel? Do this:

* install blogbench and bonnie++ from ports/benchmarks
* run:
	blogbench -c 100 -d . -i 30 -r 50 -W 10 -w 10
	bonnie++ -d . -s 16G -n 80
  in parallel, until completion or crash. It shouldn't take too long to
complete the above benchmarks, so you probably won't invest too much
time in it even if it doesn't crash.

(note: in the above command lines, "." is the current working directory,
which is on ZFS, and "16G" is "2*RAM size". Keep the "-s" argument high
even if you don't have lots of RAM.)

This assumes you have a multi-core machine on which ZFS is running. 4
would be nice, 2 is probably ok.



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