[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] VT is comically slow
On 3 Jul 2006, at 20:16, Rik van Riel wrote: Are indications of IDE being used in PIO mode. Why this is, don't ask me...A friend is trying out OpenBSD inside Xen, which shows more clearly that HVM guests are indeed using PIO :(pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0 wired to compatibility, channel 1 wired to compatibilitywd0 at pciide0 channel 0 drive 0: <QEMU HARDDISK> wd0: 16-sector PIO, LBA, 20480MB, 41943040 sectors wd0(pciide0:0:0): using PIO mode 2 pciide0: channel 1 disabled (no drives) You might need to investigate ioemu/hw/ide.c to find out why Linux/*BSD are deciding to use PIO for data transfers. Intel put in considerable effort a while back to ensure that DMA was used. Maybe that's got broken. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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