LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
* xen-blkfront: weird behavior of "iostat" after VM live-migrate which xen-blkfront module has indirect descriptors
@ 2015-01-23  7:59 Ouyang Zhaowei (Charles)
  2015-01-23 11:15 ` Roger Pau Monné
  0 siblings, 1 reply; 4+ messages in thread
From: Ouyang Zhaowei (Charles) @ 2015-01-23  7:59 UTC (permalink / raw)
  To: Roger Pau Monné; +Cc: linux-kernel, suoben, liuyingdong, weiping.ding

Hi Roger,

We are testing the indirect feature of xen-blkfront module these days.
And we found that, after VM live-migrate a couple of times, the "%util" of iostat keeps being 100%, and there are several requests stock in "avgqu-sz".
We have checked some later version of Linux, and it happens on Ubuntu 14.04, Ubuntu 14.10 and RHEL 7.0.

The iostat shows like below:

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.00    0.00    0.00    0.00    0.00  100.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
xvda              0.00     0.00    0.00    0.00     0.00     0.00     0.00     4.00    0.00    0.00    0.00   0.00 100.00
dm-0              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
dm-1              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00

Could you tell us that why is this happening, is this a bug?

Thanks!

Ouyang Zhaowei


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2015-01-30  8:37 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-01-23  7:59 xen-blkfront: weird behavior of "iostat" after VM live-migrate which xen-blkfront module has indirect descriptors Ouyang Zhaowei (Charles)
2015-01-23 11:15 ` Roger Pau Monné
2015-01-26  2:30   ` Ouyang Zhaowei (Charles)
2015-01-30  8:37     ` Ouyang Zhaowei (Charles)

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).