qemu-e2k/hw/block
Peter Lieven 95f7142abc virtio-blk: introduce multiread
this patch finally introduces multiread support to virtio-blk. While
multiwrite support was there for a long time, read support was missing.

The complete merge logic is moved into virtio-blk.c which has
been the only user of request merging ever since. This is required
to be able to merge chunks of requests and immediately invoke callbacks
for those requests. Secondly, this is required to switch to
direct invocation of coroutines which is planned at a later stage.

The following benchmarks show the performance of running fio with
4 worker threads on a local ram disk. The numbers show the average
of 10 test runs after 1 run as warmup phase.

              |        4k        |       64k        |        4k
MB/s          | rd seq | rd rand | rd seq | rd rand | wr seq | wr rand
--------------+--------+---------+--------+---------+--------+--------
master        | 1221   | 1187    | 4178   | 4114    | 1745   | 1213
multiread     | 1829   | 1189    | 4639   | 4110    | 1894   | 1216

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-02-06 17:24:21 +01:00
..
dataplane virtio-blk: introduce multiread 2015-02-06 17:24:21 +01:00
block.c blockdev: Fix blockdev-add not to create DriveInfo 2014-10-20 14:03:50 +02:00
cdrom.c bswap.h: Remove cpu_to_be32wu() 2013-11-05 19:57:47 -08:00
ecc.c savevm: Remove all the unneeded version_minimum_id_old (arm) 2014-05-13 16:09:35 +01:00
fdc.c vmstate: accept QEMUTimer in VMSTATE_TIMER*, add VMSTATE_TIMER_PTR* 2015-01-26 12:22:44 +01:00
hd-geometry.c hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
m25p80.c hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
Makefile.objs block: Always compile virtio-blk dataplane 2014-09-22 11:39:51 +01:00
nand.c hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
nvme.c NVMe: Set correct VS Value for 1.1 Compliant Controllers 2015-01-13 13:43:29 +00:00
nvme.h nvme: 64kB page size fixes 2014-12-10 10:31:16 +01:00
onenand.c hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
pflash_cfi01.c hw: Convert from BlockDriverState to BlockBackend, mostly 2014-10-20 14:02:25 +02:00
pflash_cfi02.c pflash_cfi02.c: associate "cfi.pflash02" to "Storage devices" category 2014-12-10 14:29:25 +03:00
tc58128.c
virtio-blk.c virtio-blk: introduce multiread 2015-02-06 17:24:21 +01:00
xen_blkif.h xen_disk: add discard support 2014-05-07 16:18:04 +00:00
xen_disk.c xen_disk: fix unmapping of persistent grants 2014-11-14 11:12:38 +00:00