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From: Christoph Hellwig <hch@infradead.org>
To: Chuck Lever <chuck.lever@oracle.com>
Cc: anna.schumaker@netapp.com, linux-rdma@vger.kernel.org,
	linux-nfs@vger.kernel.org
Subject: Re: [PATCH v3 05/24] xprtrdma: Reduce max_frwr_depth
Date: Tue, 11 Dec 2018 06:02:42 -0800	[thread overview]
Message-ID: <20181211140242.GC30471@infradead.org> (raw)
In-Reply-To: <20181210162945.4198.24714.stgit@manet.1015granger.net>

On Mon, Dec 10, 2018 at 11:29:45AM -0500, Chuck Lever wrote:
> Some devices advertise a large max_fast_reg_page_list_len
> capability, but perform optimally when MRs are significantly smaller
> than that depth -- probably when the MR itself is no larger than a
> page.
> 
> By default, the RDMA R/W core API uses max_sge_rd as the maximum
> page depth for MRs. For some devices, the value of max_sge_rd is
> 1, which is also not optimal. Thus, when max_sge_rd is larger than
> 1, use that value. Otherwise use the value of the
> max_fast_reg_page_list_len attribute.
> 
> I've tested this with a couple of devices, and it reproducibly
> improves the throughput of large I/Os by several percent.

Can you list which devices for reference in the changelog?

  reply	other threads:[~2018-12-11 14:02 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-10 16:29 [PATCH v3 00/24] NFS/RDMA client for next Chuck Lever
2018-12-10 16:29 ` [PATCH v3 01/24] xprtrdma: Prevent leak of rpcrdma_rep objects Chuck Lever
2018-12-10 16:29 ` [PATCH v3 02/24] IB/rxe: IB_WR_REG_MR does not capture MR's iova field Chuck Lever
2018-12-11 14:00   ` Christoph Hellwig
2018-12-11 15:26     ` Chuck Lever
2018-12-10 16:29 ` [PATCH v3 03/24] xprtrdma: Remove support for FMR memory registration Chuck Lever
2018-12-11 14:02   ` Christoph Hellwig
2018-12-11 15:29     ` Chuck Lever
2018-12-12  7:18       ` Christoph Hellwig
2018-12-10 16:29 ` [PATCH v3 04/24] xprtrdma: Fix ri_max_segs and the result of ro_maxpages Chuck Lever
2018-12-10 16:29 ` [PATCH v3 05/24] xprtrdma: Reduce max_frwr_depth Chuck Lever
2018-12-11 14:02   ` Christoph Hellwig [this message]
2018-12-11 15:30     ` Chuck Lever
2018-12-12  7:18       ` Christoph Hellwig
2018-12-10 16:29 ` [PATCH v3 06/24] xprtrdma: Plant XID in on-the-wire RDMA offset (FRWR) Chuck Lever
2018-12-10 16:29 ` [PATCH v3 07/24] xprtrdma: Recognize XDRBUF_SPARSE_PAGES Chuck Lever
2018-12-10 16:30 ` [PATCH v3 08/24] xprtrdma: Remove request_module from backchannel Chuck Lever
2018-12-10 16:30 ` [PATCH v3 09/24] xprtrdma: Expose transport header errors Chuck Lever
2018-12-10 16:30 ` [PATCH v3 10/24] xprtrdma: Simplify locking that protects the rl_allreqs list Chuck Lever
2018-12-10 16:30 ` [PATCH v3 11/24] xprtrdma: Cull dprintk() call sites Chuck Lever
2018-12-10 16:30 ` [PATCH v3 12/24] xprtrdma: Clean up of xprtrdma chunk trace points Chuck Lever
2018-12-10 16:30 ` [PATCH v3 13/24] xprtrdma: Relocate the xprtrdma_mr_map " Chuck Lever
2018-12-10 16:30 ` [PATCH v3 14/24] xprtrdma: Add trace points for calls to transport switch methods Chuck Lever
2018-12-10 16:30 ` [PATCH v3 15/24] NFS: Make "port=" mount option optional for RDMA mounts Chuck Lever
2018-12-10 16:30 ` [PATCH v3 16/24] SUNRPC: Remove support for kerberos_v1 Chuck Lever
2018-12-12 21:20   ` Chuck Lever
2018-12-14 21:16     ` Chuck Lever
2018-12-10 16:30 ` [PATCH v3 17/24] SUNRPC: Fix some kernel doc complaints Chuck Lever
2018-12-10 16:30 ` [PATCH v3 18/24] NFS: Fix NFSv4 symbolic trace point output Chuck Lever
     [not found]   ` <632f5635-4c37-16ae-cdd0-65679d21c9ec@oracle.com>
2018-12-11 19:19     ` Calum Mackay
2018-12-10 16:31 ` [PATCH v3 19/24] SUNRPC: Simplify defining common RPC trace events Chuck Lever
2018-12-10 16:31 ` [PATCH v3 20/24] xprtrdma: Trace mapping, alloc, and dereg failures Chuck Lever
2018-12-10 16:31 ` [PATCH v3 21/24] xprtrdma: Update comments in frwr_op_send Chuck Lever
2018-12-10 16:31 ` [PATCH v3 22/24] xprtrdma: Replace outdated comment for rpcrdma_ep_post Chuck Lever
2018-12-10 16:31 ` [PATCH v3 23/24] xprtrdma: Add documenting comment for rpcrdma_buffer_destroy Chuck Lever
2018-12-10 16:31 ` [PATCH v3 24/24] xprtrdma: Clarify comments in rpcrdma_ia_remove Chuck Lever
2018-12-10 17:55 ` [PATCH v3 00/24] NFS/RDMA client for next Jason Gunthorpe

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