At Wed, 29 Aug 2012 13:38:18 +0900, MORITA Kazutaka wrote: > > At Wed, 29 Aug 2012 12:18:50 +0800, > Liu Yuan wrote: > > > > On 08/29/2012 12:10 PM, MORITA Kazutaka wrote: > > > How about the following? > > > > > > -w object,disk turn on both object cache and disk cache > > > -w object turn on only object cache > > > -w disk turn on only disk cache > > > > Looks okay to me, seems that this require changes on QEMU and protocol > > between QEMU and sheepdog. > > Yes, because QEMU needs to let sheepdog know the using cache semantics > (writeback or writethrough). Perhaps, this patch should be postponed > until Sheepdog 0.5.0 and QEMU 1.2 are released.
On second thought, we don't need to modify QEMU and protocol at all. When writeback is enabled, QEMU sends I/O requests with a SD_FLAG_CMD_CACHE flag. Thanks, Kazutaka -- sheepdog mailing list sheepdog@lists.wpkg.org http://lists.wpkg.org/mailman/listinfo/sheepdog
