1. 15 Aug, 2011 1 commit
  2. 17 Jun, 2011 2 commits
  3. 11 May, 2011 9 commits
  4. 10 May, 2011 2 commits
    • Clemens Ladisch's avatar
      firewire: optimize iso queueing by setting wake only after the last packet · 13882a82
      Clemens Ladisch authored
      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: default avatarClemens Ladisch <clemens@ladisch.de>
      Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
    • Stefan Richter's avatar
      firewire: octlet AT payloads can be stack-allocated · f30e6d3e
      Stefan Richter authored
      We do not need slab allocations anymore in order to satisfy
      streaming DMA mapping constraints, thanks to commit da28947e
      "firewire: ohci: avoid separate DMA mapping for small AT payloads".
      (Besides, the slab-allocated buffers that firewire-core, firewire-sbp2,
      and firedtv used to provide for 8-byte write and lock requests were
      still not fully portable since they crossed cacheline boundaries or
      shared a cacheline with unrelated CPU-accessed data.  snd-firewire-lib
      got this aspect right by using an extra kmalloc/ kfree just for the
      8-byte transaction buffer.)
      This change replaces kmalloc'ed lock transaction scratch buffers in
      firewire-core, firedtv, and snd-firewire-lib by local stack allocations.
      Perhaps the most notable result of the change is simpler locking because
      there is no need to serialize usages of preallocated per-device buffers
      anymore.  Also, allocations and deallocations are simpler.
      Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
      Acked-by: default avatarClemens Ladisch <clemens@ladisch.de>
  5. 30 Mar, 2011 1 commit
  6. 16 Mar, 2011 1 commit
  7. 15 Mar, 2011 4 commits