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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
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
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Kconfig rbd: introduce rados block device (rbd), based on libceph 2010-10-20 15:38:13 -07:00
Makefile rbd: introduce rados block device (rbd), based on libceph 2010-10-20 15:38:13 -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.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
cciss_cmd.h
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cciss_scsi.c SCSI host lock push-down 2010-11-16 13:33:23 -08:00
cciss_scsi.h
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cpqarray.c
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cpqarray.h
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cryptoloop.c
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floppy.c floppy: fix another use-after-free 2010-11-06 07:49:56 -07:00
hd.c
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ida_cmd.h
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ida_ioctl.h
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loop.c block: remove REQ_HARDBARRIER 2010-11-10 14:54:09 +01:00
mg_disk.c
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nbd.c
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osdblk.c
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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
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rbd.c rbd: passing wrong variable to bvec_kunmap_irq() 2010-10-20 15:38:25 -07:00
rbd_types.h rbd: introduce rados block device (rbd), based on libceph 2010-10-20 15:38:13 -07:00
smart1,2.h
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sunvdc.c
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swim.c
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swim3.c
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swim_asm.S
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sx8.c
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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
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umem.h
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viodasd.c
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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
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xd.h
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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