Johan Hovold
27c7acf220
USB: serial: reimplement generic fifo-based writes ...
Reimplement fifo-based writes in the generic driver using a multiple
pre-allocated urb scheme.
In contrast to multi-urb writes, no allocations (of urbs or buffers) are
made during run-time and there is less pressure on the host stack
queues as currently only two urbs are used (implementation is generic
and can handle more than two urbs as well, though).
Initial tests using ftdi_sio show that the implementation achieves the
same (maximum) throughput at high baudrates as multi-urb writes. The CPU
usage is much lower than for multi-urb writes for small write requests
and only slightly higher for large (e.g. 2k) requests (due to extra copy
via fifo?).
Also outperforms multi-urb writes for small write requests on an
embedded arm-9 system, where multi-urb writes are CPU-bound at high
baudrates (perf reveals that a lot of time is spent in the host stack
enqueue function -- could perhaps be a bug as well).
Keeping the original write_urb, buffer and flag for now as there are
other drivers depending on them.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-05-20 13:21:42 -07:00
ACPI: sleep: eliminate duplicate entries in acpisleep_dmi_table[]
2010-05-11 10:07:53 -07:00
pata_pcmcia / ide-cs: Fix bad hashes for Transcend and kingston IDs
2010-05-05 14:48:48 -04:00
Revert "memory-hotplug: add 0x prefix to HEX block_size_bytes"
2010-04-09 10:05:33 -07:00
Merge branch 'for-jens' of git://git.drbd.org/linux-2.6-drbd into for-linus
2010-05-04 08:48:53 +02:00
tty: Fix unbalanced BKL handling in error path
2010-05-13 12:10:56 -07:00
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq
2010-04-24 11:35:21 -07:00
cpuidle: Fix incorrect optimization
2010-05-09 18:35:36 -07:00
Merge branch 'sh/for-2.6.34' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
2010-05-06 08:37:39 -07:00
edac, mce: Fix wrong mask and macro usage
2010-04-30 10:15:39 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6
2010-04-22 12:54:54 -07:00
Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip
2010-04-07 11:02:23 -07:00
it8761e_gpio: fix bug in gpio numbering
2010-05-11 17:33:41 -07:00
drivers/gpu/drm/i915/i915_irq.c:i915_error_object_create(): use correct kmap-atomic slot
2010-05-11 17:33:42 -07:00
USB: rename usb_buffer_alloc() and usb_buffer_free() users
2010-05-20 13:21:38 -07:00
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
2010-05-11 17:38:04 -07:00
i2c-core: Use per-adapter userspace device lists
2010-05-04 11:09:28 +02:00
pata_pcmcia / ide-cs: Fix bad hashes for Transcend and kingston IDs
2010-05-05 14:48:48 -04:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband
2010-04-09 11:53:06 -07:00
USB: rename usb_buffer_alloc() and usb_buffer_free() users
2010-05-20 13:21:38 -07:00
Fix ISDN/Gigaset build failure
2010-04-19 11:53:17 -07:00
lguest: stop using KVM hypercall mechanism
2010-04-14 21:43:56 +09:30
device_attributes: add sysfs_attr_init() for dynamic attributes
2010-04-07 08:38:03 -07:00
md: restore ability of spare drives to spin down.
2010-05-07 21:10:57 +10:00
USB: remove leftover references to udev->autosuspend_disabled
2010-05-20 13:21:40 -07:00
mfd: Clean up after WM83xx AUXADC interrupt if it arrives late
2010-05-13 12:58:55 +02:00
VMware Balloon driver
2010-04-24 11:31:26 -07:00
mmc: at91_mci: modify cache flush routines
2010-05-15 12:48:10 -07:00
[MTD] Remove zero-length files mtdbdi.c and internal.ho
2010-05-05 15:25:12 -04:00
USB: remove leftover references to udev->autosuspend_disabled
2010-05-20 13:21:40 -07:00
of: check for IS_ERR()
2010-04-28 01:07:29 -06:00
Revert "PCI: update bridge resources to get more big ranges in PCI assign unssigned"
2010-05-12 18:39:45 -07:00
Merge branch 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6
2010-05-07 14:11:09 -07:00
eeepc-laptop: add missing sparse_keymap_free
2010-04-23 15:23:21 -04:00
Merge branches 'bugzilla-14337', 'bugzilla-14998', 'bugzilla-15407', 'bugzilla-15903' and 'misc-2.6.34' into release
2010-05-06 22:04:31 -04:00
regulator: fix enabling regulator issue on max8925
2010-04-28 15:24:34 +01:00
rtc-mxc: multiple fixes in rtc-mxc probe method
2010-04-07 08:38:05 -07:00
[S390] dasd: fix race between tasklet and dasd_sleep_on
2010-05-12 09:32:26 +02:00
[SCSI] Retry commands with UNIT_ATTENTION sense codes to fix ext3/ext4 I/O error
2010-05-05 12:15:57 -04:00
serial: imx.c: fix CTS trigger level lower to avoid lost chars
2010-05-13 12:10:56 -07:00
omap2_mcspi: small fixes of output data format
2010-04-28 01:25:43 -06:00
MIPS: Fix SSB PCIcore IO resource management
2010-04-12 17:26:14 +01:00
USB: remove URB_NO_SETUP_DMA_MAP
2010-05-20 13:21:40 -07:00
drivers/thermal/thermal_sys.c: fix 'key f70f4b50 not in .data' in thermal_sys
2010-04-07 08:38:03 -07:00
USB: serial: reimplement generic fifo-based writes
2010-05-20 13:21:42 -07:00
vhost: fix barrier pairing
2010-05-12 18:04:04 +03:00
fbdev: bfin-t350mcqb-fb: fix fbmem allocation with blanking lines
2010-05-11 17:33:42 -07:00
virtio: Fix GFP flags passed from the virtio balloon driver
2010-04-22 07:34:05 -07:00
w1: fix omap 1-wire driver compilation
2010-04-24 11:31:25 -07:00
USB: rename usb_buffer_alloc() and usb_buffer_free() users
2010-05-20 13:21:38 -07:00
virtio: initialize earlier
2010-05-07 14:01:17 -07:00
27c7acf220