Date: Fri, 20 Jul 2012 15:58:21 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Richard Yao <ryao@gentoo.org> Cc: "hackers@FreeBSD.org" <hackers@freebsd.org>, current@freebsd.org Subject: Re: Awful FreeBSD 9 block IO performance in KVM Message-ID: <CAJ-Vmo=Gfy4D84_fPEBC1XcSp3Jm_c3uu7MmoodZBXfu9ubDDA@mail.gmail.com> In-Reply-To: <5009DB2A.7070408@gentoo.org> References: <50085193.6030203@gentoo.org> <CAJ-VmonynbAq8XaV_-dM7aEpQ1p33P3vHA1TMjsDs=ipXOsoTw@mail.gmail.com> <5009DB2A.7070408@gentoo.org>
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On 20 July 2012 15:26, Richard Yao <ryao@gentoo.org> wrote: > I am in the process of setting up a VM instance specifically for this. > While installing it, I noticed that qemu-kvm printed 'lsi_scsi: error: > ORDERED queue not implemented', which might be a clue as to why the > block device performance is bad. > > Also, I will try testing raw disk IO for Ivan after I have it setup. Thanks for setting this up. Setting up an easily reproducible environment is by far the biggest and most helpful step here. Adrianhome | help
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