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| author |   Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2015-03-12 20:02:36 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-04-16 12:44:56 -0700 |
| commit | f1600e549b948a32ad7672e069b2915314637ae3 (patch) | |
| tree | 1386e80c8654c0a88b80c56f605a2705e0f4a115 /arch/sparc/kernel/iommu_common.h | |
| parent | sparc: Break up monolithic iommu table/lock into finer graularity pools and lock (diff) | |
| download | linux-dev-f1600e549b948a32ad7672e069b2915314637ae3.tar.xz linux-dev-f1600e549b948a32ad7672e069b2915314637ae3.zip | |
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/iommu_common.h')
| -rw-r--r-- | arch/sparc/kernel/iommu_common.h | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/arch/sparc/kernel/iommu_common.h b/arch/sparc/kernel/iommu_common.h index 1ec0de4156e7..f4be0d724fc6 100644 --- a/arch/sparc/kernel/iommu_common.h +++ b/arch/sparc/kernel/iommu_common.h @@ -48,12 +48,4 @@ static inline int is_span_boundary(unsigned long entry, return iommu_is_span_boundary(entry, nr, shift, boundary_size); } -unsigned long iommu_range_alloc(struct device *dev, - struct iommu *iommu, - unsigned long npages, - unsigned long *handle); -void iommu_range_free(struct iommu *iommu, - dma_addr_t dma_addr, - unsigned long npages); - #endif /* _IOMMU_COMMON_H */ |