Hi!
> 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 <[email protected]>
> ---
>
> 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 dbd4d6c..be4fdd7 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");
Huh, two version bumps for... ONE ONE-LINER :-).
Could we get rid of embedded version? It helps no one.
--
Thanks for all the (sleeping) penguins.
-
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