From: Tom Talpey <tom@talpey.com>
To: Chuck Lever <chuck.lever@oracle.com>,
linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org
Subject: Re: [PATCH v2 07/14] xprtrdma: Remove logic that constructs RDMA_MSGP type calls
Date: Tue, 14 Jul 2015 15:00:51 -0400 [thread overview]
Message-ID: <55A55C63.50403@talpey.com> (raw)
In-Reply-To: <20150713163048.17630.86326.stgit@manet.1015granger.net>
On 7/13/2015 12:30 PM, Chuck Lever wrote:
> RDMA_MSGP type calls insert a zero pad in the middle of the RPC
> message to align the RPC request's data payload to the server's
> alignment preferences. A server can then "page flip" the payload
> into place to avoid a data copy in certain circumstances. However:
>...
>
> Clean up the marshaling code by removing the logic that constructs
> RDMA_MSGP type calls. This also reduces the maximum send iovec size
> from four to just two elements.
>
> diff --git a/net/sunrpc/xprtrdma/xprt_rdma.h b/net/sunrpc/xprtrdma/xprt_rdma.h
> index 8219011..0b50103 100644
> --- a/net/sunrpc/xprtrdma/xprt_rdma.h
> +++ b/net/sunrpc/xprtrdma/xprt_rdma.h
...>
> +#define RPCRDMA_MAX_IOVS (4)
> +
So, shouldn't this constant be "2"? The extra 2 iov's were used
only for constructing the pad.
next prev parent reply other threads:[~2015-07-14 19:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-13 16:29 [PATCH v2 00/14] NFS/RDMA client side for Linux 4.3 Chuck Lever
2015-07-13 16:29 ` [PATCH v2 01/14] xprtrdma: Make xprt_setup_rdma() agnostic to family of server address Chuck Lever
2015-07-13 16:30 ` [PATCH v2 02/14] xprtrdma: Raise maximum payload size to one megabyte Chuck Lever
2015-07-13 16:30 ` [PATCH v2 03/14] xprtrdma: Increase default credit limit Chuck Lever
2015-07-13 16:30 ` [PATCH v2 04/14] xprtrdma: Don't fall back to PHYSICAL memory registration Chuck Lever
2015-07-13 16:30 ` [PATCH v2 05/14] xprtrdma: Remove last ib_reg_phys_mr() call site Chuck Lever
2015-07-13 16:30 ` [PATCH v2 06/14] xprtrdma: Clean up rpcrdma_ia_open() Chuck Lever
2015-07-13 16:30 ` [PATCH v2 07/14] xprtrdma: Remove logic that constructs RDMA_MSGP type calls Chuck Lever
2015-07-14 19:00 ` Tom Talpey [this message]
2015-07-14 19:01 ` Chuck Lever
2015-07-15 18:26 ` Devesh Sharma
2015-07-15 21:29 ` Chuck Lever
2015-07-13 16:30 ` [PATCH v2 08/14] xprtrdma: Account for RPC/RDMA header size when deciding to inline Chuck Lever
2015-07-13 16:31 ` [PATCH v2 09/14] xprtrdma: Always provide a write list when sending NFS READ Chuck Lever
2015-07-13 16:31 ` [PATCH v2 10/14] xprtrdma: Don't provide a reply chunk when expecting a short reply Chuck Lever
2015-07-13 16:31 ` [PATCH v2 11/14] xprtrdma: Fix XDR tail buffer marshalling Chuck Lever
2015-07-13 16:31 ` [PATCH v2 12/14] xprtrdma: Fix large NFS SYMLINK calls Chuck Lever
2015-07-13 16:31 ` [PATCH v2 13/14] xprtrdma: Clean up xprt_rdma_print_stats() Chuck Lever
2015-07-13 16:31 ` [PATCH v2 14/14] xprtrdma: Count RDMA_NOMSG type calls Chuck Lever
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