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-unsubscr...@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)
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