Sowmini Varadhan bb620c3d39 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>		2015-04-18 12:32:59 -07:00
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asm	sparc: Make sparc64 use scalable lib/iommu-common.c functions	2015-04-18 12:32:59 -07:00
uapi/asm	sparc: hook up execveat system call	2014-12-13 12:42:51 -08:00