Anthony Liguori schrieb: (...)
> I don't believe a PV block driver is actually necessary. Disk devices > are actually quite slow (unless you have a large array). With a few > small changes (bump MMU cache up to 1024 and actually enable the aio > subsystem), SCSI emulation does as well as Xen's PV block driver (about > 210 mb/sec whereas native is around 250 mb/sec). There's a lot of room > to optimize the SCSI emulation too since there are a number of copies in > that path. > > The SCSI emulation is a lot like what one would design in a PV driver. > It supports multiple outstanding requests and doesn't require a whole > lot of exits to submit a request (it uses scripts). How does one enable SCSI emulation? "qemu-system-x86_64 -h" gives no hints about SCSI (at least in KVM-18); similarly, I didn't find anything in the archive or in the wiki. Certainly, there is a kvm-18/qemu/hw/scsi-disk.c file, so it's like the feature is there... Is it possible to boot a guest from a "SCSI-emulated" device? -- Tomasz Chmielewski http://wpkg.org ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/kvm-devel
