Messages in this thread Patch in this message | | | From | Chris Leech <> | Subject | [PATCH 1/7] I/OAT: Push pending transactions to hardware more frequently | Date | Wed, 18 Oct 2006 16:46:48 -0700 |
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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> ---
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 0358419..f3b34b5 100644 --- a/drivers/dma/ioatdma.c +++ b/drivers/dma/ioatdma.c @@ -310,7 +310,7 @@ static dma_cookie_t do_ioat_dma_memcpy(s 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 } /* MODULE API */ -MODULE_VERSION("1.7"); +MODULE_VERSION("1.9"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Intel Corporation"); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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