Date: Sat, 21 Jul 2012 23:54:03 -0400 From: Richard Yao <ryao@gentoo.org> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> 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: <500B795B.7000307@gentoo.org> In-Reply-To: <alpine.BSF.2.00.1207211014481.1535@wojtek.tensor.gdynia.pl> References: <50085193.6030203@gentoo.org> <CAJ-VmonynbAq8XaV_-dM7aEpQ1p33P3vHA1TMjsDs=ipXOsoTw@mail.gmail.com> <5009DB2A.7070408@gentoo.org> <500A13A6.7030503@gentoo.org> <alpine.BSF.2.00.1207211014481.1535@wojtek.tensor.gdynia.pl>
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[-- Attachment #1 --] On 07/21/2012 04:15 AM, Wojciech Puchar wrote: >> 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. > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" You are right. It is not capped at that speed: root@freebsd:/root # dd if=/dev/zero of=/dev/da1 bs=16384 count=262144 262144+0 records in 262144+0 records out 4294967296 bytes transferred in 615.840721 secs (6974153 bytes/sec) [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJQC3leAAoJECDuEZm+6ExkIaoP/AlnAKsNV/TKyZE06jLnptUr vB+ta9hq3V3wnSbQbWKYTdCbqRP5Rsc6Q6t5ixPND/VmtEEFStQDtYN3qWKQauwT fGwOGBNCyAnRtbAhtaLGOaIzTmVzj4LOdEfzDQJxkIg1xdoERBxrO0w+tm5Axun2 FaTMZlrRpalp17whe+gcHv0RZGR73B4uRbKtXKkSt/38mCoOX7ghWMvgkCd3OTC3 tf8xbRtPBKk6GzozdELEPkQBE0NDADmUjFGCUGqz7ogkgFDSp7rR0YJeukmVosIZ x4KLXlEiDls49+3SCLRIRP8XYhZ9IkR1+XJNIvQi+MLltrj98XwjbBuzKDXbjp8t VGiGZEfLfoz88wfqtjA6Af2xcSiAg1W5pXdz1NB1Fg63YrHrRQSMb17wW0RvY4i9 5mroZbqAQmrgMSHN74/+5O8eMOCgo8d+IqxSy3pHrEd+Z+fH9NyVmSU+AByjLU2f nwITMDfd1MqvnNQbRTP80JjSDha5DYT5l56S8XvgmB5q9gJ8j+qsI2qXtmNBQDye W9ngQiyiXU+SSAdyPPajIYt9rCCvw8itrE23wuq23TEecbO2EvvycrIs6n+IG/U9 HQWhxOSS3BabsykiLD3eBVLCFwK1Wiux+nXpfEwOYHruM49bR8OdTbaZUb4YyQ1K aatz/dHc8PjO1JGg+iSd =dodR -----END PGP SIGNATURE-----home | help
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