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

[Alexander Motin]

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, ...)?

-- 
Alexander Motin