Date: Mon, 31 Aug 2009 13:08:08 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Kai Gallasch <gallasch@free.de> Cc: freebsd-fs@freebsd.org Subject: Re: need help with ZFS Message-ID: <20090831110808.GF1671@garage.freebsd.pl> In-Reply-To: <20090830191336.5f1cdec0@orwell.free.de> References: <4A927CB3.3040402@plus-plus.su> <4A964F4E.4080009@plus-plus.su> <4A9656CE.8020107@plus-plus.su> <367b2c980908270316n7a21673ek3a997573f2fadbb0@mail.gmail.com> <4A96731D.20406@plus-plus.su> <4A967680.2030205@plus-plus.su> <4A969D20.40809@plus-plus.su> <20090829160037.GA1848@garage.freebsd.pl> <20090830191336.5f1cdec0@orwell.free.de>
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--lHGcFxmlz1yfXmOs Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Aug 30, 2009 at 07:13:36PM +0200, Kai Gallasch wrote: > On Sat, 29 Aug 2009 18:00:37 +0200 > wrote Pawel Jakub Dawidek <pjd@FreeBSD.org>: >=20 > > > bonnie++ -s17000 -d. -n128 > > >=20 > > > for about 10 minutes: > > >=20 > > > http://omploader.org/vMjg5aQ/IMG_0057.jpg =20 > > [...] > >=20 > > I'm running your test on pretty low-end h/w (i386, 1GB of RAM, two > > cores) and cannot reproduce the problem for few hours now. The only > > tuning I did was to set vm.kmem_size to 1GB. You still need to do > > this very tuning even on amd64. >=20 > Hi. > Could you give a short explanation why on amd64 it is still necessary > to set vm.kmem_size to 1GB ? I thought with zfs on FreeBSD-7.2-STABLE > tuning kmem was not necessary any more. Actually I might be wrong. I was sure I saw amd64 machine with low vm.kmem_size, but I checked on 8GB RAM machine and it is auto-tuned to more than 2.5GB. I still prefer to set it to 8GB just in case and eventually limit ARC size. > The reason I ask is, I have some servers on FreeBSD-7.2-STABLE > AMD64 that are quite stable, but sometimes suffer from zfs > performance degradation when zfs is competing with applications using > huge amounts of RAM. Those servers are not swapping at all when this > takes place. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --lHGcFxmlz1yfXmOs Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFKm68YForvXbEpPzQRAlwAAJ9LslfdIc3l3tThig/8lDN0VEkZfgCfcuvF epG2rQJKkCYsxpk+9kQr/mA= =KmSg -----END PGP SIGNATURE----- --lHGcFxmlz1yfXmOs--
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