On Mon, Jun 25, 2012 at 01:56:42PM +0800, Liu Yuan wrote: > Dunno others, but current Linux virtio_blk driver can only issue as much > as 4 requests in one go. IDE driver is less than 4 I think. From the > driver perspective, it seems that only scsi driver can issue more than 4 > requests in one go, but QEMU support to emulate scsi disk ? > > Anyway, this is just a hint. Suppose request size from guest is 512k, > then 4M / 512k = 8, so at most 8 request can be issued to one sheep > object. So I think 8 is enough. Please add the above as a comment for the constant. It might also make sense to allow tuning this value. |