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>
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@ -310,7 +310,7 @@ static dma_cookie_t do_ioat_dma_memcpy(struct ioat_dma_chan *ioat_chan,
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list_splice_init(&new_chain, ioat_chan->used_desc.prev);
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ioat_chan->pending += desc_count;
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if (ioat_chan->pending >= 20) {
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if (ioat_chan->pending >= 4) {
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append = 1;
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ioat_chan->pending = 0;
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}
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@ -818,7 +818,7 @@ static void __devexit ioat_remove(struct pci_dev *pdev)
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}
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/* MODULE API */
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MODULE_VERSION("1.7");
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MODULE_VERSION("1.9");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Intel Corporation");
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