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From: Ruslan Kovtun <yalur@mail.ru>
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Date: Sun, 4 May 2008 18:11:11 +0300
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Cc: freebsd-fs@freebsd.org, Daniel Andersson <engywook@gmail.com>
Subject: Re: Choppy performance.
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=F7 =D3=CF=CF=C2=DD=C5=CE=C9=C9 =CF=D4 =F7=CF=D3=CB=D2=C5=D3=C5=CE=D8=C5 04=
 =CD=C1=D1 2008 Gary Jennejohn =CE=C1=D0=C9=D3=C1=CC(a):
> On Sun, 4 May 2008 11:03:30 +0200
>
> "Daniel Andersson" <engywook@gmail.com> wrote:
> > > vm.kmem_size_max=3D"1073741824"
> > >  vm.kmem_size=3D"1073741824"
> > >  KVA_PAGES=3D512
> > >  Write speed in 8 disks (raidz) is 40 Mb/sec and very choppy.
> > >  If I change to vm.kmem_size_max=3D"999M", write speed increase in 4
> > > times (160Mb/sec). I think this is bug.
> > >  What is yours configuration?
> >
> > My loader.conf(AMD64):
> >
> > vfs.zfs.prefetch_disable=3D1
> > vm.kmem_size_max=3D"1073741824"
> > vm.kmem_size=3D"1073741824"
> >
> > I'll try setting it to 999M instead, thanks!
>
> I just tried setting it to 999M for kicks (amd64) and saw no significant
> speed up doing a ``make -j4 buildworld''.  I only saw a time difference
> of 20 seconds between 1024M and 999M, which is just in the noise.

So, This bug related with i386 only.

>
> ---
> Gary Jennejohn



=2D-=20
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