Date: Mon, 8 Jun 2015 19:43:04 +0530 From: Sibananda Sahu <sibananda.sahu@avagotech.com> To: freebsd-scsi@freebsd.org Cc: "Kenneth D. Merry" <ken@freebsd.org>, scottl@freebsd.org, Scott Long <scott4long@yahoo.com>, Konstantin Belousov <kostikbel@gmail.com> Subject: IO stall in FreeBSD 9.1 Message-ID: <74957f591aa372aee413a4f9fadda2e4@mail.gmail.com>
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Hi all,
I am working on mrsas(4) driver for AVAGO=E2=80=99s 3108 Invader controller=
s in
FreeBSD.
Recently while testing on FreeBSD-9.1-RELEASE I have observed that IOs
running on VDs behind AVAGO 3108 controller, stalls after a while.
I have two VDs, both configured of RAID0.
I use fio(1) for to fire IOs to the disks with posixaio as the ioengine.
POST ISSUE ANALYSIS DATA:
In the gstat(1) utility it shows some pending items in the Queue and there
is no activity of IO but fio(1) is running in the background.
dT: 1.002s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps
ms/w %busy Name
11 0 0 0 0.0 0 0
0.0 0.0|da0
32 0 0 0 0.0 0 0
0.0 0.0| da1
0 0 0 0 0.0 0 0
0.0 0.0| ada0
0 0 0 0 0.0 0 0
0.0 0.0| ada0p1
0 0 0 0 0.0 0 0
0.0 0.0| ada0p2
0 0 0 0 0.0 0 0
0.0 0.0| ada0p3
I have also used the same configuration on FreeBSD-8.4-RELEASE and
FreeBSD-10.0-RELEASE and the issue is not seen.
IOs were running consistently and there was no IO stall at all.
Furthermore, I have also checked that if mrsas(4) driver is causing this
issue, but to my surprise mrsas(4) is not at all called after that IO stall=
.
I mean to say, the SIM driver=E2=80=99s action callback (mrsas_action() in =
this
case) is not at all called.
Below is a dmesg log of camcontrol debug =E2=80=93TSX [bus:target:lun] afte=
r IO
stall:
http://www.infysim.org/wp-content/dmesg_camcontrol_debug
Can anyone provide any solution/suggestion to this issue?
Thanks,
Sibananda Sahu
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