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| author | Clemens Ladisch <clemens@ladisch.de> | 2011-05-02 07:33:56 (GMT) |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2011-05-10 20:53:45 (GMT) |
| commit | 13882a82ee1646336c3996c93b4a560a55d2a419 (patch) | |
| tree | 8a144d874a0ac46273a7e2f2dd344458d7eb4bfa /drivers/firewire/core-iso.c | |
| parent | f30e6d3e419bfb5540fa82ba7eca01d578556e6b (diff) | |
| download | linux-fsl-qoriq-13882a82ee1646336c3996c93b4a560a55d2a419.tar.xz | |
firewire: optimize iso queueing by setting wake only after the last packet
When queueing iso packets, the run time is dominated by the two
MMIO accesses that set the DMA context's wake bit. Because most
drivers submit packets in batches, we can save much time by
removing all but the last wakeup.
The internal kernel API is changed to require a call to
fw_iso_context_queue_flush() after a batch of queued packets.
The user space API does not change, so one call to
FW_CDEV_IOC_QUEUE_ISO must specify multiple packets to take
advantage of this optimization.
In my measurements, this patch reduces the time needed to queue
fifty skip packets from userspace to one sixth on a 2.5 GHz CPU,
or to one third at 800 MHz.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/core-iso.c')
| -rw-r--r-- | drivers/firewire/core-iso.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c index f872ede..57c3973 100644 --- a/drivers/firewire/core-iso.c +++ b/drivers/firewire/core-iso.c @@ -185,6 +185,12 @@ int fw_iso_context_queue(struct fw_iso_context *ctx, } EXPORT_SYMBOL(fw_iso_context_queue); +void fw_iso_context_queue_flush(struct fw_iso_context *ctx) +{ + ctx->card->driver->flush_queue_iso(ctx); +} +EXPORT_SYMBOL(fw_iso_context_queue_flush); + int fw_iso_context_stop(struct fw_iso_context *ctx) { return ctx->card->driver->stop_iso(ctx); |