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| author | Chris Leech <christopher.leech@intel.com> | 2007-03-08 09:57:33 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2007-07-11 15:39:03 -0700 |
| commit | 000725d56a196e72dc22328324c5ec5506265736 (patch) | |
| tree | 7189116b48efd57b2de74cc924d39fc885cf4d9e | |
| parent | 7dcca30a32aadb0520417521b0c44f42d09fe05c (diff) | |
| download | blackbird-op-linux-000725d56a196e72dc22328324c5ec5506265736.tar.gz blackbird-op-linux-000725d56a196e72dc22328324c5ec5506265736.zip | |
ioatdma: Push pending transactions to hardware more frequently
Every 20 descriptors turns out to be to few append commands with
newer/faster CPUs. Pushing every 4 still cuts down on MMIO writes to an
acceptable level without letting the DMA engine run out of work.
Signed-off-by: Chris Leech <christopher.leech@intel.com>
| -rw-r--r-- | drivers/dma/ioatdma.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c index 850014139556..4e6afd752034 100644 --- a/drivers/dma/ioatdma.c +++ b/drivers/dma/ioatdma.c @@ -310,7 +310,7 @@ static dma_cookie_t do_ioat_dma_memcpy(struct ioat_dma_chan *ioat_chan, list_splice_init(&new_chain, ioat_chan->used_desc.prev); ioat_chan->pending += desc_count; - if (ioat_chan->pending >= 20) { + if (ioat_chan->pending >= 4) { append = 1; ioat_chan->pending = 0; } @@ -818,7 +818,7 @@ static void __devexit ioat_remove(struct pci_dev *pdev) } /* MODULE API */ -MODULE_VERSION("1.7"); +MODULE_VERSION("1.9"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Intel Corporation"); |
