Date: Mon, 8 Jun 2009 00:46:31 -0700 From: Kip Macy <kmacy@freebsd.org> To: Kai Gallasch <gallasch@free.de> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS v13 performance drops with low memory on FreeBSD-7 STABLE Message-ID: <3c1674c90906080046q1bdcafci7dc1b30df7a4a169@mail.gmail.com> In-Reply-To: <20090608090123.13c21d5f@boiler.free.de> References: <4A2AA48B.20803@free.de> <h0hnil$r5h$1@ger.gmane.org> <20090608090123.13c21d5f@boiler.free.de>
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The inactive queue can cause the ARC to be shrunk down to almost nothing. This is in need of fixing. Cheers, Kip On Mon, Jun 8, 2009 at 12:01 AM, Kai Gallasch<gallasch@free.de> wrote: > On Mon, 08 Jun 2009 02:55:22 +0200 > wrote Ivan Voras <ivoras@freebsd.org>: > >> Kai Gallasch wrote: >> > Hi. >> > >> > So for me this looks like when running applications and ZFS compete >> > for free RAM, ZFS looses. Is that so? >> >> Yes, that was the point of recent work in stabilizing ZFS - without it >> you would probably panic. With it, ZFS's memory is shrunk down. Unless >> there are other factors (like swapping; are you swapping on ZFS?), >> this is the probable reason for what you're seeing. > > No. Swapspace is on a standard swap partition outside the zpool. > # swapinfo > Device =A0 =A0 =A0 =A0 =A01K-blocks =A0 =A0 Used =A0 =A0Avail Capacity > /dev/da0s3b =A0 =A0 =A0 8388608 =A0 =A011636 =A08376972 =A0 =A0 0% > > There's barely swapping taking place on the server. > > --Kai. > > > --=20 When bad men combine, the good must associate; else they will fall one by one, an unpitied sacrifice in a contemptible struggle. Edmund Burke
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