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c13f7e1a94
linux-next/drivers/block
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Lars Ellenberg c13f7e1a94 drbd: don't recvmsg with zero length 
This should fix a performance degradation we observed recently.

If we don't expect any subheader, we should not call into the tcp stack,
as that may add considerable latency if there is no data available at
this point.

For a synthetic synchronous write load with single outstanding writes,
this additional latency when processing the "unplug remote" packet
added up to a performance degradation factor >= 10.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
2010-11-27 19:50:43 +01:00
..
aoe block: remove REQ_HARDBARRIER 2010-11-10 14:54:09 +01:00
drbd drbd: don't recvmsg with zero length 2010-11-27 19:50:43 +01:00
paride Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
amiflop.c block: fix amiga and atari floppy driver compile warning 2010-11-15 19:32:43 +01:00
ataflop.c block: fix amiga and atari floppy driver compile warning 2010-11-15 19:32:43 +01:00
brd.c Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:07:18 -07:00
cciss_cmd.h cciss: fix hard reset code. 2010-08-07 18:52:30 +02:00
cciss_scsi.c SCSI host lock push-down 2010-11-16 13:33:23 -08:00
cciss_scsi.h cciss: remove C99-style comments 2010-02-22 13:44:45 +01:00
cciss.c cciss: fix build for PROC_FS disabled 2010-11-17 11:56:13 +01:00
cciss.h cciss: fix board status waiting code 2010-10-23 18:45:06 +02:00
cpqarray.c block: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:10 +02:00
cpqarray.h
cryptoloop.c drivers: Remove unnecessary inclusions of asm/semaphore.h 2008-04-18 22:16:32 -04:00
DAC960.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
DAC960.h Fix DAC960 driver on machines which don't support 64-bit DMA 2007-09-11 17:21:19 -07:00
floppy.c floppy: fix another use-after-free 2010-11-06 07:49:56 -07:00
hd.c block: remove wrappers for request type/flags 2010-08-07 18:17:56 +02:00
ida_cmd.h
ida_ioctl.h
Kconfig rbd: introduce rados block device (rbd), based on libceph 2010-10-20 15:38:13 -07:00
loop.c block: remove REQ_HARDBARRIER 2010-11-10 14:54:09 +01:00
Makefile rbd: introduce rados block device (rbd), based on libceph 2010-10-20 15:38:13 -07:00
mg_disk.c block: switch s390 tape_block and mg_disk to elevator_change() 2010-08-23 14:02:44 +02:00
nbd.c block: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:10 +02:00
osdblk.c block: remove spurious uses of REQ_HARDBARRIER 2010-09-10 12:35:36 +02:00
pktcdvd.c Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:07:18 -07:00
ps3disk.c Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:07:18 -07:00
ps3vram.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rbd_types.h rbd: introduce rados block device (rbd), based on libceph 2010-10-20 15:38:13 -07:00
rbd.c rbd: passing wrong variable to bvec_kunmap_irq() 2010-10-20 15:38:25 -07:00
smart1,2.h
sunvdc.c block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
swim3.c block: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:10 +02:00
swim_asm.S m68k: mac - Add SWIM floppy support 2009-03-26 21:15:27 +01:00
swim.c block: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:10 +02:00
sx8.c block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
ub.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2010-10-22 20:30:48 -07:00
umem.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
umem.h drivers/block/umem: trim trailing whitespace 2007-10-10 09:25:59 +02:00
viodasd.c block: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:10 +02:00
virtio_blk.c Merge branch 'for-2.6.37/barrier' of git://git.kernel.dk/linux-2.6-block 2010-10-22 17:07:18 -07:00
xd.c block: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:10 +02:00
xd.h [PATCH] switch xd 2008-10-21 07:48:11 -04:00
xen-blkfront.c block: remove REQ_HARDBARRIER 2010-11-10 14:54:09 +01:00
xsysace.c Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-10-25 08:19:14 -07:00
z2ram.c drivers/block/z2ram.c: correct printing of sector_t 2010-10-28 06:15:26 -06:00