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| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2015-04-09 15:33:31 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-04-18 12:32:59 -0700 |
| commit | bb620c3d3925aec0ed4f21010c86df08ec18a8c7 (patch) | |
| tree | f3adfa12c95f9aa6dd844fd47fd486332bbd0a2e /lib | |
| parent | ff7d37a502022149655c18035b99a53391be0383 (diff) | |
| download | op-kernel-dev-bb620c3d3925aec0ed4f21010c86df08ec18a8c7.zip op-kernel-dev-bb620c3d3925aec0ed4f21010c86df08ec18a8c7.tar.gz | |
sparc: Make sparc64 use scalable lib/iommu-common.c functions
In iperf experiments running linux as the Tx side (TCP client) with
10 threads results in a severe performance drop when TSO is disabled,
indicating a weakness in the software that can be avoided by using
the scalable IOMMU arena DMA allocation.
Baseline numbers before this patch:
with default settings (TSO enabled) : 9-9.5 Gbps
Disable TSO using ethtool- drops badly: 2-3 Gbps.
After this patch, iperf client with 10 threads, can give a
throughput of at least 8.5 Gbps, even when TSO is disabled.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions
