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Commit 000725d5 authored by Chris Leech's avatar Chris Leech Committed by Dan Williams
Browse files

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: default avatarChris Leech <christopher.leech@intel.com>
parent 7dcca30a

drivers/dma/ioatdma.c

+2 −2
Original line number Diff line number Diff line
@@ -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");