From: Chris Leech <christopher.leech@intel.com>
To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH 1/9] ioatdma: Push pending transactions to hardware more frequently
Date: Fri, 02 Mar 2007 18:24:17 -0800 [thread overview]
Message-ID: <20070303022417.31033.72244.stgit@gitlost.site> (raw)
In-Reply-To: <20070303022238.31033.84558.stgit@gitlost.site>
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 8e87261..0f77a9d 100644
--- a/drivers/dma/ioatdma.c
+++ b/drivers/dma/ioatdma.c
@@ -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");
next prev parent reply other threads:[~2007-03-03 2:39 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-03 2:22 [PATCH 0/9] I/OAT fixes Chris Leech
2007-03-03 2:24 ` Chris Leech [this message]
2007-03-03 3:14 ` [PATCH 1/9] ioatdma: Push pending transactions to hardware more frequently Jeff Garzik
2007-03-03 4:27 ` David Miller
2007-03-03 6:00 ` Chris Leech
2007-03-03 2:24 ` [PATCH 2/9] drivers/dma: handle sysfs errors Chris Leech
2007-03-03 2:24 ` [PATCH 3/9] ioatdma: Remove the wrappers around read(bwl)/write(bwl) in ioatdma Chris Leech
2007-03-03 2:24 ` [PATCH 4/9] ioatdma: Remove the use of writeq from the ioatdma driver Chris Leech
2007-03-03 2:24 ` [PATCH 5/9] I/OAT: Add documentation for the tcp_dma_copybreak sysctl Chris Leech
2007-03-03 2:24 ` [PATCH 6/9] I/OAT: Add entries to MAINTAINERS for the DMA memcpy subsystem and ioatdma Chris Leech
2007-03-03 2:24 ` [PATCH 7/9] I/OAT: Only offload copies for TCP when there will be a context switch Chris Leech
2007-03-03 2:24 ` [PATCH 8/9] I/OAT: warning fix Chris Leech
2007-03-03 2:24 ` [PATCH 9/9] I/OAT: fix I/OAT for kexec Chris Leech
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070303022417.31033.72244.stgit@gitlost.site \
--to=christopher.leech@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).