On Tue, 27 Oct 2009 05:18:35 am Michael S. Tsirkin wrote:
> Hi!
> I noticed a performance regression in virtio net: going from
> 2.6.31 to 2.6.32-rc4 I see this, for guest to host communication:
...
> Size SizeSize Time Throughput
> bytes bytes bytessecs.10^6bits/sec
>
>
Hi,
> +/* The current Qemu infrastructure allows only for LUN 0 */
> +if (lun == 0&& target< MAX_RAID_DEVS)
> + cmd->lun =&s->luns[target];
One more thing which should be fixed in qemu instead of worked around in
your driver. After all even good old parallel scsi knows multiple
Hi,
> The device can be accessed by
>
> -drive if=raid,file=XXX
Don't extend that qemu automagic please. The new way to handle this is:
-drive if=none,id=mydisk,file=/path/to/some/disk.img
-device megasas,id=raid
-device scsi-disk,bus=raid.0,scsi-id=1,drive=mydisk
> In order to sup
Now that we can use SCSI command emulation without using the SCSI
disk abstraction we can easily add it to the megasas HBA.
Signed-off-by: Hannes Reinecke
---
hw/megasas.c | 88 +++---
1 files changed, 53 insertions(+), 35 deletions(-)
diff
Other drives might want to use SCSI command emulation without
going through the SCSI disk abstraction, as this imposes too
many limits on the emulation.
Signed-off-by: Hannes Reinecke
---
block.c| 15 ++
block.h|3 +
block_int.h|1 +
hw/scsi-disk.c | 610 +
This patch add an emulation for the LSI MegaRAID SAS HBA. It is
using SG_IO to forward / pass through SCSI commands to the
underlying block driver, so no emulation is done currently.
Signed-off-by: Hannes Reinecke
---
Makefile.hw |2 +-
hw/megasas.c | 1134 +
Hi all,
this patchset implements an emulation for the megaraid_sas HBA.
It provides emulates an LSI MegaRAID SAS 8708EM2 HBA, ie
presenting to the guest a virtual SCSI adapter.
Internally it is using aio for read/write requests and
either SG_IO or SCSI command emulation for everything else.
The r
This patch adds a 'raid' interface class. It is basically a clone
of the existing 'scsi' interface, only allowing up to 128 disks.
Signed-off-by: Hannes Reinecke
---
hw/pc.c |5 +
hw/pci-hotplug.c |1 +
hw/scsi-disk.c | 17 +
hw/scsi-disk.h | 20
On 10/26/2009 08:48 PM, Michael S. Tsirkin wrote:
> Hi!
> I noticed a performance regression in virtio net: going from
> 2.6.31 to 2.6.32-rc4 I see this, for guest to host communication:
>
> Any tips on debugging this?
>
Lacking better advice, a bisect can help as a last resort. 'git bisect
