Re: aacraid: Regression in 4.14.56 with *genirq/affinity: assign vectors to all possible CPUs*
From: Paul Menzel
Date: Sat Aug 11 2018 - 04:14:24 EST
Dear Greg,
Am 10.08.2018 um 17:55 schrieb Greg Kroah-Hartman:
On Fri, Aug 10, 2018 at 04:11:23PM +0200, Paul Menzel wrote:
On 08/10/18 15:36, Greg Kroah-Hartman wrote:
On Fri, Aug 10, 2018 at 03:21:52PM +0200, Paul Menzel wrote:
Dear Greg,
Commit ef86f3a7 (genirq/affinity: assign vectors to all possible CPUs) added
for Linux 4.14.56 causes the aacraid module to not detect the attached devices
anymore on a Dell PowerEdge R720 with two six core 24x E5-2630 @ 2.30GHz.
```
$ dmesg | grep raid
[ 0.269768] raid6: sse2x1 gen() 7179 MB/s
[ 0.290069] raid6: sse2x1 xor() 5636 MB/s
[ 0.311068] raid6: sse2x2 gen() 9160 MB/s
[ 0.332076] raid6: sse2x2 xor() 6375 MB/s
[ 0.353075] raid6: sse2x4 gen() 11164 MB/s
[ 0.374064] raid6: sse2x4 xor() 7429 MB/s
[ 0.379001] raid6: using algorithm sse2x4 gen() 11164 MB/s
[ 0.386001] raid6: .... xor() 7429 MB/s, rmw enabled
[ 0.391008] raid6: using ssse3x2 recovery algorithm
[ 3.559682] megaraid cmm: 2.20.2.7 (Release Date: Sun Jul 16 00:01:03 EST 2006)
[ 3.570061] megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST 2006)
[ 10.725767] Adaptec aacraid driver 1.2.1[50834]-custom
[ 10.731724] aacraid 0000:04:00.0: can't disable ASPM; OS doesn't have ASPM control
[ 10.743295] aacraid: Comm Interface type3 enabled
$ lspci -nn | grep Adaptec
04:00.0 Serial Attached SCSI controller [0107]: Adaptec Series 8 12G SAS/PCIe 3 [9005:028d] (rev 01)
42:00.0 Serial Attached SCSI controller [0107]: Adaptec Smart Storage PQI 12G SAS/PCIe 3 [9005:028f] (rev 01)
```
But, it still works with a Dell PowerEdge R715 with two eight core AMD
Opteron 6136, the card below.
```
$ lspci -nn | grep Adaptec
22:00.0 Serial Attached SCSI controller [0107]: Adaptec Series 8 12G SAS/PCIe 3 [9005:028d] (rev 01)
```
Reverting the commit fixes the issue.
commit ef86f3a72adb8a7931f67335560740a7ad696d1d
Author: Christoph Hellwig <hch@xxxxxx>
Date: Fri Jan 12 10:53:05 2018 +0800
genirq/affinity: assign vectors to all possible CPUs
commit 84676c1f21e8ff54befe985f4f14dc1edc10046b upstream.
Currently we assign managed interrupt vectors to all present CPUs. This
works fine for systems were we only online/offline CPUs. But in case of
systems that support physical CPU hotplug (or the virtualized version of
it) this means the additional CPUs covered for in the ACPI tables or on
the command line are not catered for. To fix this we'd either need to
introduce new hotplug CPU states just for this case, or we can start
assining vectors to possible but not present CPUs.
Reported-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Tested-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Tested-by: Stefan Haberland <sth@xxxxxxxxxxxxxxxxxx>
Fixes: 4b855ad37194 ("blk-mq: Create hctx for each present CPU")
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
The problem doesnât happen with Linux 4.17.11, so there are commits in
Linux master fixing this. Unfortunately, my attempts to find out failed.
I was able to cherry-pick the three commits below on top of 4.14.62,
but the problem persists.
6aba81b5a2f5 genirq/affinity: Don't return with empty affinity masks on error
355d7ecdea35 scsi: hpsa: fix selection of reply queue
e944e9615741 scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
Trying to cherry-pick the commits below, referencing the commit
in question, gave conflicts.
1. adbe552349f2 scsi: megaraid_sas: fix selection of reply queue
2. d3056812e7df genirq/affinity: Spread irq vectors among present CPUs as far as possible
To avoid further trial and error with the server with a slow firmware,
do you know what commits should fix the issue?
Look at the email on the stable mailing list:
Subject: Re: Fix for 84676c1f (b5b6e8c8) missing in 4.14.y
it should help you out here.
Ah, I didnât see that [1] yet. Also I canât find the original message, and a
way to reply to that thread. Therefore, here is my reply.
Can you try the patches listed there?
I tried some of these already without success.
b5b6e8c8d3b4 scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
2f31115e940c scsi: core: introduce force_blk_mq
adbe552349f2 scsi: megaraid_sas: fix selection of reply queue
The commit above is already in v4.14.56.
8b834bff1b73 scsi: hpsa: fix selection of reply queue
The problem persists.
The problem also persists with the state below.
3528f73a4e5d scsi: core: introduce force_blk_mq
16dc4d8215f3 scsi: hpsa: fix selection of reply queue
f0a7ab12232d scsi: virtio_scsi: fix IO hang caused by automatic irq vector affinity
6aba81b5a2f5 genirq/affinity: Don't return with empty affinity masks on error
1aa1166eface (tag: v4.14.62, stable/linux-4.14.y) Linux 4.14.62
So, some more commits are necessary.
Or I revert the original patch here, and the follow-on ones that were
added to "fix" this issue. I think that might be the better thing
overall here, right? Have you tried that?
Yes, reverting the commit fixed the issue for us. If Christoph or Ming
do not have another suggestion for a commit, that would be the way to go.
Kind regards,
Paul