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| author | Stephan Gatzka <stephan@gatzka.org> | 2011-09-26 21:44:30 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2011-10-09 17:00:18 +0200 |
| commit | a74477db9171e677b7a37b89e6e0ac8a15ba1f26 (patch) | |
| tree | 72f6a3ba84ef8db0bcbb58c75384e2aa9ccd1c9f /drivers/firewire/ohci.c | |
| parent | 4ec4a67aa100268b4ac5ae32b54843d975969969 (diff) | |
| download | linux-a74477db9171e677b7a37b89e6e0ac8a15ba1f26.tar.bz2 | |
firewire: net: Use posted writes
Change memory region to ohci "middle address space". This effectively
reduces the number of packets by 50%.
[Stefan R.:] This eliminates 1394 ack packets and improved throughput
by a few percent in some tests with an S400a connection with and without
gap count optimization. Since firewire-net taxes the AR-req DMA unit of
a FireWire controller much more than firewire-sbp2 (which uses the
middle address space with PCI posted writes too), this commit also
changes a related error printk into a ratelimited one as a precaution.
Side note: The IPv4-over-1394 drivers of Mac OS X 10.4, Windows XP SP3,
and the Thesycon 1394 bus driver for Windows all use the middle address
space too.
Signed-off-by: Stephan Gatzka <stephan@gatzka.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/ohci.c')
| -rw-r--r-- | drivers/firewire/ohci.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 399d5926caf7..bffc2ad7ecab 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -2045,7 +2045,8 @@ static irqreturn_t irq_handler(int irq, void *data) reg_read(ohci, OHCI1394_PostedWriteAddressLo); reg_write(ohci, OHCI1394_IntEventClear, OHCI1394_postedWriteErr); - fw_error("PCI posted write error\n"); + if (printk_ratelimit()) + fw_error("PCI posted write error\n"); } if (unlikely(event & OHCI1394_cycleTooLong)) { |