From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Cc: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org,
bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org,
target-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 7/9] IB/core: generic RDMA READ/WRITE API
Date: Tue, 1 Mar 2016 08:21:04 +0100 [thread overview]
Message-ID: <20160301072104.GA32603@lst.de> (raw)
In-Reply-To: <56D4C615.5010202-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
On Mon, Feb 29, 2016 at 04:28:37PM -0600, Steve Wise wrote:
>> + ret = rdma_rw_init_mr_wrs(ctx, qp, port_num, sg, sg_offset,
>> + remote_addr, rkey, dir);
>
> At some point I would like the iWARP IO to do no-mr for WRITE/dma_nents ==
> 1, and WRITE/dma_nents <= max_send_sge for the device. I think this will
> help smaller iSER/NVMEF READ IOPs. I'm testing this out now on the NVMEF
> code, which is slightly different. If it proves out to better the
> performance, I'll post a follow-on patch...
Yes, this should work fine. My plan was to have the bare API in place
for now and then allow HCA drivers to fine tune the idea eventually.
My idea was to have a threshold set by the driver from where to start
registering the memory for case where it not required (WRITE on all HCAs,
READ for !iWarp).
--
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next prev parent reply other threads:[~2016-03-01 7:21 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 22:20 generic RDMA READ/WRITE API V2 Christoph Hellwig
2016-02-29 22:20 ` [PATCH 3/9] IB/core: add a helper to check for READ WITH INVALIDATE support Christoph Hellwig
2016-03-01 9:02 ` Sagi Grimberg
2016-03-01 9:14 ` Christoph Hellwig
[not found] ` <56D55ABA.6070007-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2016-03-01 15:45 ` Steve Wise
2016-03-03 13:10 ` 'Christoph Hellwig'
2016-03-03 15:31 ` Steve Wise
2016-03-03 17:53 ` Jason Gunthorpe
[not found] ` <20160303175301.GD15387-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-03-03 17:56 ` 'Christoph Hellwig'
[not found] ` <1456784410-20166-1-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-02-29 22:20 ` [PATCH 1/9] IB/cma: pass the port number to ib_create_qp Christoph Hellwig
2016-02-29 22:20 ` [PATCH 2/9] IB/core: allow passing mapping an offset into the SG in ib_map_mr_sg Christoph Hellwig
2016-02-29 23:13 ` Bart Van Assche
2016-03-01 6:50 ` Christoph Hellwig
2016-02-29 22:20 ` [PATCH 4/9] IB/core: refactor ib_create_qp Christoph Hellwig
2016-02-29 22:20 ` [PATCH 5/9] IB/core: add a simple MR pool Christoph Hellwig
2016-02-29 22:36 ` Bart Van Assche
2016-03-01 6:48 ` Christoph Hellwig
2016-03-01 19:12 ` Bart Van Assche
[not found] ` <56D5E989.9010006-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-03-02 9:14 ` Christoph Hellwig
2016-02-29 22:20 ` [PATCH 6/9] IB/core: add a need_inval flag to struct ib_mr Christoph Hellwig
2016-02-29 22:40 ` Bart Van Assche
[not found] ` <56D4C8EC.8020805-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2016-03-01 7:09 ` Christoph Hellwig
2016-02-29 22:20 ` [PATCH 7/9] IB/core: generic RDMA READ/WRITE API Christoph Hellwig
[not found] ` <1456784410-20166-8-git-send-email-hch-jcswGhMUV9g@public.gmane.org>
2016-02-29 22:28 ` Steve Wise
[not found] ` <56D4C615.5010202-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
2016-03-01 7:21 ` Christoph Hellwig [this message]
2016-03-01 9:00 ` Sagi Grimberg
[not found] ` <56D55A1B.6030902-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2016-03-01 9:13 ` Christoph Hellwig
[not found] ` <20160301091338.GA2208-jcswGhMUV9g@public.gmane.org>
2016-03-01 9:19 ` Sagi Grimberg
[not found] ` <56D55EB3.2050707-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2016-03-01 15:47 ` Steve Wise
2016-03-01 15:44 ` Steve Wise
2016-02-29 23:12 ` Bart Van Assche
2016-03-01 6:50 ` Christoph Hellwig
2016-03-03 10:53 ` Sagi Grimberg
2016-03-03 12:02 ` Christoph Hellwig
[not found] ` <20160303120209.GC20543-jcswGhMUV9g@public.gmane.org>
2016-03-03 12:08 ` Sagi Grimberg
2016-03-03 12:22 ` Christoph Hellwig
2016-03-03 12:54 ` Sagi Grimberg
[not found] ` <56D8293C.1050306-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2016-03-03 15:29 ` Steve Wise
2016-03-03 18:05 ` 'Christoph Hellwig'
2016-02-29 22:20 ` [PATCH 8/9] target: enhance and export target_alloc_sgl/target_free_sgl Christoph Hellwig
2016-02-29 22:20 ` [PATCH 9/9] IB/srpt: convert to the generic RDMA READ/WRITE API Christoph Hellwig
2016-03-01 21:38 ` Bart Van Assche
2016-03-02 9:14 ` Christoph Hellwig
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