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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