** Description changed:
Description of problem:
When used as a Xen guest, Ubuntu 13.10 may be slower than older releases in
terms of storage performance. This is due to the persistent-grants feature
introduced in xen-blkfront on the Linux Kernel 3.8 series. From 3.8 to 3.12
(inclusive),
I am unable to collect logs with apport-collect as I do not have a set of
Ubuntu guests setup for repro at the moment.
I also believe logs are not relevant for this particular case.
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Joseph, apologies for the delay on this. I have finally managed to
retest the kernel you have provided.
For reference, I added the following disks to my server:
* 4 x Micron P320
* 2 x Intel 910s (presented as 4 separate SCSI devices)
* 1 x Fusion-io ioDrive2
I created 10 LVM Logical Volumes on
** Attachment added: Saucy x86_64 without the backports
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319003/+attachment/4123531/+files/saucy.png
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** Attachment added: Saucy x86_64 with the backports
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319003/+attachment/4123532/+files/saucy-backports.png
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** Attachment removed: Saucy x86_64 without the backports
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319003/+attachment/4123531/+files/saucy.png
** Attachment removed: Saucy x86_64 with the backports
** Attachment added: Saucy x86_64 guests without the backports
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319003/+attachment/4123555/+files/saucy64.png
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gt);
return virtscsi_queuecommand(vscsi, req_vq, sc);
Signed-off-by: Felipe Franciosi
-
- Please consider this a urgent fix as all of our customers which use Ubuntu
16.04 and have MQ enabled for better performance will be affected by your
latest update. Our workaround is to recommen
sc);
Signed-off-by: Felipe Franciosi
Please consider this a urgent fix as all of our customers which use
Ubuntu 16.04 and have MQ enabled for better performance will be
affected by your latest update. Our workaround is to recommend that
they disable SCSI MQ while you work on the issue.
Best
virtscsi_pick_vq_mq(vscsi, sc);
- else
+ atomic_inc(>reqs);
+ } else
req_vq = virtscsi_pick_vq(vscsi, tgt);
return virtscsi_queuecommand(vscsi, req_vq, sc);
Signed-off-by: Felipe Franciosi
Please consider this a urgent fix as all of our c
mand(vscsi, req_vq, sc);
Signed-off-by: Felipe Franciosi
Please consider this a urgent fix as all of our customers which use
Ubuntu 16.04 and have MQ enabled for better performance will be
affected by your latest update. Our workaround is to recommend that
they disable SCSI MQ while
req_vq = virtscsi_pick_vq_mq(vscsi, sc);
- atomic_inc(>reqs);
- } else
+ else
req_vq = virtscsi_pick_vq(vscsi, tgt);
return virtscsi_queuecommand(vscsi, req_vq, sc);
Signed-off-by: Felipe Franciosi
Please consider this a urgent fix as all of our c
vq = virtscsi_pick_vq(vscsi, tgt);
return virtscsi_queuecommand(vscsi, req_vq, sc);
Signed-off-by: Felipe Franciosi
Please consider this a urgent fix as all of our customers which use Ubuntu
16.04 and have MQ enabled for better performance will be affected by your
latest u
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