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f3c66a2f56
linux/net/sunrpc/xprtrdma
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Chuck Lever f3c66a2f56 xprtrdma: Boost maximum transport header size 
Although I haven't seen any performance results that justify it,
I've received several complaints that NFS/RDMA no longer supports
a maximum rsize and wsize of 1MB. These days it is somewhat smaller.

To simplify the logic that determines whether a chunk list is
necessary, the implementation uses a fixed maximum size of the
transport header. Currently that maximum size is 256 bytes, one
quarter of the default inline threshold size for RPC/RDMA v1.

Since commit a78868497c ("xprtrdma: Reduce max_frwr_depth"), the
size of chunks is also smaller to take advantage of inline page
lists in device internal MR data structures.

The combination of these two design choices has reduced the maximum
NFS rsize and wsize that can be used for most RNIC/HCAs. Increasing
the maximum transport header size and the maximum number of RDMA
segments it can contain increases the negotiated maximum rsize/wsize
on common RNIC/HCAs.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2019-08-20 11:09:46 -04:00
..
backchannel.c SUNRPC: Fix up backchannel slot table accounting 2019-07-18 01:12:59 -04:00
frwr_ops.c xprtrdma: Fix calculation of ri_max_segs again 2019-08-20 11:01:03 -04:00
Makefile xprtrdma: Remove support for FMR memory registration 2019-01-02 12:05:17 -05:00
module.c NFS client updates for Linux 4.18 2018-06-12 10:09:03 -07:00
rpc_rdma.c Merge tag 'nfs-rdma-for-5.3-1' of git://git.linux-nfs.org/projects/anna/linux-nfs 2019-07-12 12:11:01 -04:00
svc_rdma_backchannel.c SUNRPC: Remove the bh-safe lock requirement on xprt->transport_lock 2019-07-06 14:54:48 -04:00
svc_rdma_recvfrom.c svcrdma: Remove syslog warnings in work completion handlers 2019-02-06 15:37:15 -05:00
svc_rdma_rw.c scsi: lib/sg_pool.c: improve APIs for allocating sg pool 2019-06-20 15:21:33 -04:00
svc_rdma_sendto.c svcrdma: Remove syslog warnings in work completion handlers 2019-02-06 15:37:15 -05:00
svc_rdma_transport.c SUNRPC: Remove the bh-safe lock requirement on xprt->transport_lock 2019-07-06 14:54:48 -04:00
svc_rdma.c sunrpc: remove svc_rdma_bc_class 2018-12-27 21:01:41 -05:00
transport.c Merge branch 'akpm' (patches from Andrew) 2019-07-19 09:45:58 -07:00
verbs.c xprtrdma: Boost maximum transport header size 2019-08-20 11:09:46 -04:00
xprt_rdma.h xprtrdma: Boost maximum transport header size 2019-08-20 11:09:46 -04:00