cam(4) timeouts in bhyve/kyua runs up on Jenkins?

[Garrett Cooper]

On Apr 28, 2015, at 0:54, Alexander Motin <mav at FreeBSD.org> wrote:

> Hi.
> 
> On 27.04.2015 21:17, Garrett Cooper wrote:
>> On Apr 27, 2015, at 11:16, Garrett Cooper <yaneurabeya at gmail.com>
>> wrote:
>> 
>>> I was looking at the console log for the latest kyua run and I’ve
>>> noticed that it’s timing out a bit more [1] than it was
>>> previously [2]. I’ve seen some of your commits recently to cam(4)
>>> dealing with bhyve — has there been a performance regression
>>> there? Thanks! -NGie
>>> 
>>> 1.
>>> https://jenkins.freebsd.org/job/FreeBSD_HEAD-tests2/940/console
>>> 2.
>>> https://jenkins.freebsd.org/job/FreeBSD_HEAD-tests2/983/console
>> 
>> (Sorry for not being more explicit for the archives) These are the
>> timeouts I’m referring to:
>> 
>> ahcich0: is 00000000 cs 00000000 ss 1f000000 rs 1f000000 tfd 50
>> serr 00000000 cmd 1000dc17 (ada0:ahcich0:0:0:0):
>> WRITE_FPDMA_QUEUED. ACB: 61 08 a8 54 1e 40 00 00 00 00 00 00
>> (ada0:ahcich0:0:0:0): CAM status: Command timeout
>> (ada0:ahcich0:0:0:0): Retrying command
> 
> Last time I was more working on bhyve host disk emulation, rather then
> on cam(4) running on guest. Considering that, what guest and what host
> versions are you running? Is there any other load on host except this VM
> that could cause I/O delays high enough to trigger timeouts? What are
> you using to back the virtual disk (file, zvol, ...)?

I have no idea what the Jenkins slaves are running in terms of configuration/version/etc. You’ll have to ask jenkins-admin@…
Thanks!
-NGie
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