From: John Garry <john.garry@huawei.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>,
<linux-block@vger.kernel.org>, <linux-scsi@vger.kernel.org>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Jens Axboe <axboe@kernel.dk>,
Douglas Gilbert <dgilbert@interlog.com>
Subject: Re: [bug report] shared tags causes IO hang and performance drop
Date: Fri, 16 Apr 2021 09:29:37 +0100 [thread overview]
Message-ID: <217e4cc1-c915-0e95-1d1c-4a11496080d6@huawei.com> (raw)
In-Reply-To: <YHjeUrCTbrSft18t@T590>
On 16/04/2021 01:46, Ming Lei wrote:
>> I can't seem to recreate your same issue. Are you mainline defconfig, or a
>> special disto config?
> The config is rhel8 config.
>
Can you share that? Has anyone tested against mainline x86 config?
> As I mentioned, with deadline, IOPS drop is observed on one hardware(ibm-x3850x6)
> which is exactly the machine Yanhui reported the cpu utilization issue.
>
> On another machine(HP DL380G10), still 32cores, dual numa nodes, IOPS drop can't be
> observed, but cpu utilization difference is still obserable.
>
> I use scsi_debug just because it is hard to run the virt workloads on
> that machine. And the reported issue is on megaraid_sas, which is a scsi
> device, so null_blk isn't good to simulate here because it can't cover
> scsi stack.
Understood. Apart from scsi_debug, the only thing I can readily compare
hosttags vs non-hosttags for scsi stack on is a megaraid_sas system with
1x SATA disk. Or hack with hisi_sas to support both.
Thanks,
John
next prev parent reply other threads:[~2021-04-16 8:32 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 7:50 [bug report] shared tags causes IO hang and performance drop Ming Lei
2021-04-14 10:10 ` John Garry
2021-04-14 10:38 ` Ming Lei
2021-04-14 10:42 ` Kashyap Desai
2021-04-14 11:12 ` Ming Lei
2021-04-14 12:06 ` John Garry
2021-04-15 3:46 ` Ming Lei
2021-04-15 10:41 ` John Garry
2021-04-15 12:18 ` Ming Lei
2021-04-15 15:41 ` John Garry
2021-04-16 0:46 ` Ming Lei
2021-04-16 8:29 ` John Garry [this message]
2021-04-16 8:39 ` Ming Lei
2021-04-16 14:59 ` John Garry
2021-04-20 3:06 ` Douglas Gilbert
2021-04-20 3:22 ` Bart Van Assche
2021-04-20 4:54 ` Douglas Gilbert
2021-04-20 6:52 ` Ming Lei
2021-04-20 20:22 ` Douglas Gilbert
2021-04-21 1:40 ` Ming Lei
2021-04-23 8:43 ` John Garry
2021-04-26 10:53 ` John Garry
2021-04-26 14:48 ` Ming Lei
2021-04-26 15:52 ` John Garry
2021-04-26 16:03 ` Ming Lei
2021-04-26 17:02 ` John Garry
2021-04-26 23:59 ` Ming Lei
2021-04-27 7:52 ` John Garry
2021-04-27 9:11 ` Ming Lei
2021-04-27 9:37 ` John Garry
2021-04-27 9:52 ` Ming Lei
2021-04-27 10:15 ` John Garry
2021-07-07 17:06 ` John Garry
2021-04-14 13:59 ` Kashyap Desai
2021-04-14 17:03 ` Douglas Gilbert
2021-04-14 18:19 ` John Garry
2021-04-14 19:39 ` Douglas Gilbert
2021-04-15 0:58 ` Ming Lei
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