From: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
To: Jack Wang <xjtuwjp-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: David Dillow <dave-i1Mk8JYDVaaSihdK6806/g@public.gmane.org>,
David Dillow <dad-1Heg1YXhbW8@public.gmane.org>,
Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Vu Pham <vuhuong-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Sebastian Riemer
<sebastian.riemer-EIkl63zCoXaH+58JC4qpiA@public.gmane.org>,
linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Konrad Grzybowski <konradg-XLFqaoR9dsI@public.gmane.org>
Subject: Re: [PATCH 8/8] IB/srp: Make queue size configurable
Date: Fri, 13 Sep 2013 16:31:27 +0200 [thread overview]
Message-ID: <523321BF.9020403@acm.org> (raw)
In-Reply-To: <52331E01.3060005-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On 09/13/13 16:15, Jack Wang wrote:
> Hello Bart,
>
>> cat /sys/class/scsi_host/host36/req_lim
>> 64
>
> I just checked srp spec, which do define such behaviour, I wonder in
> SCST/SRPT, how the request limit is chosen, is it report from low level
> hardware driver?
Hello Jack,
The following code probably provides the information you are looking for:
/*
* Avoid QUEUE_FULL conditions by limiting the number of buffers used
* for the SRP protocol to the SCST SCSI command queue size.
*/
ch->rq_size = min(SRPT_RQ_SIZE, scst_get_max_lun_commands(NULL, 0));
In other words, req_lim can be increased by increasing both SRPT_RQ_SIZE
and SCST_MAX_DEV_COMMANDS.
Bart.
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next prev parent reply other threads:[~2013-09-13 14:31 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-20 12:41 [PATCH 0/8] IB SRP initiator patches for kernel 3.12 Bart Van Assche
[not found] ` <521363EA.8080906-HInyCGIudOg@public.gmane.org>
2013-08-20 12:43 ` [PATCH 1/8] IB/srp: Keep rport as long as the IB transport layer Bart Van Assche
2013-08-20 12:44 ` [PATCH 2/8] scsi_transport_srp: Add transport layer error handling Bart Van Assche
2013-08-20 12:45 ` [PATCH 3/8] IB/srp: Add srp_terminate_io() Bart Van Assche
2013-08-20 12:46 ` [PATCH 4/8] IB/srp: Use SRP transport layer error recovery Bart Van Assche
2013-08-20 12:46 ` [PATCH 5/8] IB/srp: Start timers if a transport layer error occurs Bart Van Assche
2013-08-20 12:47 ` [PATCH 6/8] IB/srp: Make transport layer retry count configurable Bart Van Assche
2013-08-20 12:48 ` [PATCH 7/8] IB/srp: Introduce srp_alloc_req_data() Bart Van Assche
2013-08-20 12:50 ` [PATCH 8/8] IB/srp: Make queue size configurable Bart Van Assche
[not found] ` <52136609.3090406-HInyCGIudOg@public.gmane.org>
2013-08-20 15:34 ` Sagi Grimberg
[not found] ` <52138C6E.6080201-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2013-08-20 15:55 ` Bart Van Assche
[not found] ` <5213917B.3020403-HInyCGIudOg@public.gmane.org>
2013-08-20 17:43 ` David Dillow
[not found] ` <1377020595.22321.6.camel-zHLflQxYYDO4Hhoo1DtQwJ9G+ZOsUmrO@public.gmane.org>
2013-08-21 7:19 ` Sagi Grimberg
2013-09-10 3:01 ` David Dillow
[not found] ` <1378782080.3794.6.camel-VK19RVc5TWXUd6DVheFtbw@public.gmane.org>
2013-09-10 17:44 ` Bart Van Assche
[not found] ` <522F5A81.8040101-HInyCGIudOg@public.gmane.org>
2013-09-11 22:16 ` David Dillow
[not found] ` <1378937796.6649.5.camel-a7a0dvSY7KqLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2013-09-12 16:16 ` Jack Wang
[not found] ` <5231E8CE.5060105-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-12 16:30 ` Bart Van Assche
[not found] ` <5231EC1A.7030902-HInyCGIudOg@public.gmane.org>
2013-09-13 8:06 ` Jack Wang
[not found] ` <5232C76B.4010704-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-13 8:40 ` Bart Van Assche
[not found] ` <5232CF86.20507-HInyCGIudOg@public.gmane.org>
2013-09-13 9:24 ` Bart Van Assche
[not found] ` <5232D9BC.7090808-HInyCGIudOg@public.gmane.org>
2013-09-13 12:25 ` Jack Wang
[not found] ` <5233043F.5020804-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-13 13:33 ` Bart Van Assche
[not found] ` <52331444.8070007-HInyCGIudOg@public.gmane.org>
2013-09-13 13:51 ` Jack Wang
[not found] ` <52331854.9010607-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-13 14:03 ` Bart Van Assche
[not found] ` <52331B47.9070202-HInyCGIudOg@public.gmane.org>
2013-09-13 14:15 ` Jack Wang
[not found] ` <52331E01.3060005-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-13 14:31 ` Jack Wang
2013-09-13 14:31 ` Bart Van Assche [this message]
2013-09-16 14:25 ` Bart Van Assche
[not found] ` <523714D8.3020104-HInyCGIudOg@public.gmane.org>
2013-09-16 14:28 ` David Dillow
2013-09-10 2:53 ` [PATCH 0/8] IB SRP initiator patches for kernel 3.12 David Dillow
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