From: Sagi Grimberg <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
To: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: iSER initiator in 4.5 is unhappy..
Date: Thu, 7 Apr 2016 18:16:06 +0300 [thread overview]
Message-ID: <570679B6.10409@grimberg.me> (raw)
In-Reply-To: <570623B9.8040108-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
>>
>> We communicate the "max_pages" via sg_tablesize and max_hw_sectors.
>>
>> iSER communicates (or at least supposed to) sg_tablesize=128 and
>> max_sectors=1024 to scsi (which sets the block queues attributes), that
>> should be sufficient for handling all the incoming IO. Unless we didn't
>> account for the first-page offset and the reminder coming at the last
>> segment (which results in an extra page). The patch should fix the
>> problem, however in this particular sg list I don't see the violation
>> (counted 127 pages)...
>
> I counted 129 pages.
> I will run some tests in our labs too.
If you did then that indicates the block layer violates
its obligation to respect max_segments/max_hw_sectors?
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next prev parent reply other threads:[~2016-04-07 15:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-04 13:46 iSER initiator in 4.5 is unhappy Christoph Hellwig
[not found] ` <20160404134656.GA30269-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-04 14:42 ` Max Gurtovoy
[not found] ` <57027D48.4000500-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-04-04 15:10 ` Christoph Hellwig
2016-04-04 17:29 ` sagig
[not found] ` <5702A46F.5070109-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-04 17:38 ` sagig
[not found] ` <5702A6AC.9020008-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-04 22:58 ` Christoph Hellwig
[not found] ` <20160404225831.GA6725-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-05 8:55 ` sagig
[not found] ` <57037D8E.4030506-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-05 9:43 ` Christoph Hellwig
[not found] ` <20160405094339.GA1622-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-06 17:34 ` sagig
[not found] ` <570548AB.4090802-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-06 23:16 ` Christoph Hellwig
[not found] ` <20160406231658.GB11588-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-07 7:14 ` Sagi Grimberg
[not found] ` <570608C9.1070805-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-07 9:09 ` Max Gurtovoy
[not found] ` <570623B9.8040108-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-04-07 15:16 ` Sagi Grimberg [this message]
[not found] ` <570679B6.10409-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-04-07 15:20 ` Christoph Hellwig
2016-04-07 22:13 ` Christoph Hellwig
[not found] ` <20160407221359.GA16686-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-08 1:42 ` Bart Van Assche
2016-04-10 13:30 ` Max Gurtovoy
[not found] ` <570A5563.5060104-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-04-10 14:52 ` Christoph Hellwig
2016-04-12 21:33 ` Bart Van Assche
2016-04-04 22:46 ` Christoph Hellwig
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