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From: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
To: Sagi Grimberg
	<sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
	Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org,
	target-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 02/13] IB/core: allow passing mapping an offset into the SG in ib_map_mr_sg
Date: Mon, 29 Feb 2016 16:22:03 -0600	[thread overview]
Message-ID: <56D4C48B.8010602@opengridcomputing.com> (raw)
In-Reply-To: <56D33356.1020707-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>



On 2/28/2016 11:50 AM, Sagi Grimberg wrote:
>
>> I think you're right.  Do you have any good suggestion how to trigger
>> iSER first burst data, as apparently my normal testing didn't hit
>> this?
>
> The first burst should happen by default (against LIO which support
> ImmediateData and UnsolicitedDataOut). But it won't make a difference
> for the initiator which registers the entire buffer, sends the first
> burst and let the target read the rest accordingly...
>
> Perhaps if you change the iscsi tpg FirstBurstLength to be subpage say
> 3k (default is 64k) you can get the isert (when using MRs over iwarp)
> hit this...
>
> Steve can you help?

I can try this out.  Did this discussion result in needing a code change 
though?

Also, one acid test I do that produced non-zero initial offsets for 
nfsrdma server was mounting a large ramdisk to the client and build the 
kernel with 'make -j 16 O=blah' with O= pointing to the mounted remote 
ramdisk.  nfsrdma is very different from iser/block protocols but its 
still a good (evil) test. :)


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  parent reply	other threads:[~2016-02-29 22:22 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-27 18:10 RFC: a first draft of a generic RDMA READ/WRITE API Christoph Hellwig
     [not found] ` <1456596631-19418-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-02-27 18:10   ` [PATCH 01/13] IB/cma: pass the port number to ib_create_qp Christoph Hellwig
2016-02-27 18:10   ` [PATCH 02/13] IB/core: allow passing mapping an offset into the SG in ib_map_mr_sg Christoph Hellwig
     [not found]     ` <1456596631-19418-3-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-02-28 14:57       ` Sagi Grimberg
2016-02-28 16:20         ` Christoph Hellwig
2016-02-28 17:50           ` Sagi Grimberg
     [not found]             ` <56D33356.1020707-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2016-02-29 22:22               ` Steve Wise [this message]
2016-02-29 11:15         ` Christoph Hellwig
     [not found]           ` <20160229111557.GA11499-jcswGhMUV9g@public.gmane.org>
2016-02-29 11:35             ` Sagi Grimberg
2016-02-29 11:56               ` Christoph Hellwig
2016-02-29 12:08                 ` Sagi Grimberg
2016-02-27 18:10   ` [PATCH 03/13] IB/core: add a helper to check for READ WITH INVALIDATE support Christoph Hellwig
2016-02-27 18:10   ` [PATCH 05/13] IB/core: add a simple MR pool Christoph Hellwig
2016-03-02  2:48     ` Parav Pandit
2016-03-02  9:15       ` Christoph Hellwig
2016-03-02 15:22         ` Bart Van Assche
     [not found]           ` <56D70543.1000506-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-03-03  8:30             ` Christoph Hellwig
2016-02-27 18:10   ` [PATCH 07/13] IB/core: generic RDMA READ/WRITE API Christoph Hellwig
2016-02-28 15:05     ` Sagi Grimberg
2016-02-27 18:10   ` [PATCH 08/13] IB/isert: properly type the login buffer Christoph Hellwig
2016-02-27 18:10   ` [PATCH 09/13] IB/isert: convert to new CQ API Christoph Hellwig
2016-02-27 18:10   ` [PATCH 10/13] IB/isert: kill struct isert_rdma_wr Christoph Hellwig
2016-02-27 18:10   ` [PATCH 12/13] IB/core: add a MR pool for signature MRs Christoph Hellwig
2016-02-27 18:10 ` [PATCH 04/13] IB/core: refactor ib_create_qp Christoph Hellwig
2016-02-27 18:10 ` [PATCH 06/13] IB/core: add a need_inval flag to struct ib_mr Christoph Hellwig
2016-02-28 15:10   ` Sagi Grimberg
2016-02-28 16:05     ` Christoph Hellwig
2016-02-27 18:10 ` [PATCH 11/13] IB/isert: the kill ->isert_cmd back pointer in the struct iser_tx_desc Christoph Hellwig
2016-02-27 18:10 ` [PATCH 13/13] IB/isert: RW API WIP Christoph Hellwig
2016-02-28 13:57   ` Sagi Grimberg
2016-02-28 16:04     ` Christoph Hellwig

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