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 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 [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
