Date: Sat, 21 Jul 2012 10:15:15 +0200 (CEST) From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> To: Richard Yao <ryao@gentoo.org> Cc: Adrian Chadd <adrian@freebsd.org>, "hackers@FreeBSD.org" <hackers@freebsd.org>, current@freebsd.org, ivoras@freebsd.org Subject: Re: Awful FreeBSD 9 block IO performance in KVM Message-ID: <alpine.BSF.2.00.1207211014481.1535@wojtek.tensor.gdynia.pl> In-Reply-To: <500A13A6.7030503@gentoo.org> References: <50085193.6030203@gentoo.org> <CAJ-VmonynbAq8XaV_-dM7aEpQ1p33P3vHA1TMjsDs=ipXOsoTw@mail.gmail.com> <5009DB2A.7070408@gentoo.org> <500A13A6.7030503@gentoo.org>
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> da0: <QEMU QEMU HARDDISK 1.1.> Fixed Direct Access SCSI-5 device > da0: 3.300MB/s transfers > da0: Command Queueing enabled > da0: 409600MB (838860800 512 byte sectors: 255H 63S/T 52216C) > > It does not explain why virtio is slow though, although I still need to > test virtio against the latest code. I will do ivan's raw block test > against virtio-blk, mainly because there is no point in doing it against > a device whose transfers have been capped to 3.3MB/sec. are you sure it is really capped? i am not. just emulated sym device reports low speed.
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