Dongli Zhang bf348f9b78 virtio-blk: limit number of hw queues by nr_cpu_ids ...

When tag_set->nr_maps is 1, the block layer limits the number of hw queues
by nr_cpu_ids. No matter how many hw queues are used by virtio-blk, as it
has (tag_set->nr_maps == 1), it can use at most nr_cpu_ids hw queues.

In addition, specifically for pci scenario, when the 'num-queues' specified
by qemu is more than maxcpus, virtio-blk would not be able to allocate more
than maxcpus vectors in order to have a vector for each queue. As a result,
it falls back into MSI-X with one vector for config and one shared for
queues.

Considering above reasons, this patch limits the number of hw queues used
by virtio-blk by nr_cpu_ids.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2019-04-10 08:18:24 -06:00

..

aoe

aoe: add __exit annotation

2018-12-16 09:01:38 -07:00

drbd

for-4.21/block-20190102

2019-01-02 18:49:58 -08:00

mtip32xx

for-5.1/block-20190302

2019-03-08 14:12:17 -08:00

paride

paride/pcd: Fix potential NULL pointer dereference and mem leak

2019-04-05 09:24:34 -06:00

rsxx

pci-v4.20-changes

2018-10-25 06:50:48 -07:00

xen-blkback

xen/blkback: rework connect_ring() to avoid inconsistent xenstore 'ring-page-order' set by malicious blkfront

2019-02-24 10:17:56 -05:00

zram

drivers/block/zram/zram_drv.c: fix idle/writeback string compare

2019-03-29 10:01:37 -07:00

amiflop.c

block/amiflop: Don't log error message on invalid ioctl

2018-12-31 10:19:11 -07:00

ataflop.c

ataflop: implement mq_ops->commit_rqs() hook

2018-11-29 10:12:27 -07:00

brd.c

block: brd: associate with queue until adding disk

2018-11-01 19:59:51 -06:00

cryptoloop.c

block: cryptoloop: Remove VLA usage of skcipher

2018-09-28 12:46:07 +08:00

floppy.c

for-5.1/block-20190302

2019-03-08 14:12:17 -08:00

Kconfig

drivers/block: Remove DAC960 driver

2018-10-17 09:42:30 -06:00

loop.c

loop: access lo_backing_file only when the loop device is Lo_bound

2019-03-18 08:20:53 -06:00

loop.h

block/loop: Use global lock for ioctl() operation.

2018-11-08 06:30:11 -07:00

Makefile

drivers/block: Remove DAC960 driver

2018-10-17 09:42:30 -06:00

nbd.c

nbd: propagate genlmsg_reply return code

2019-02-28 14:06:37 -07:00

null_blk_main.c

null_blk: prevent crash from bad home_node value

2019-04-06 10:51:08 -06:00

null_blk_zoned.c

null_blk: Add conventional zone configuration for zoned support

2018-11-07 13:41:50 -07:00

null_blk.h

null_blk: add zoned config support information

2019-01-06 10:58:27 -07:00

pktcdvd.c

pktcdvd: remove queue_lock around blk_queue_max_hw_sectors

2018-11-16 09:16:59 -07:00

ps3disk.c

ps3disk: convert to blk-mq

2018-10-15 20:07:56 -06:00

ps3vram.c

block: genhd: add 'groups' argument to device_add_disk

2018-09-28 08:30:28 -06:00

rbd_types.h

rbd: RBD_V{1,2}_DATA_FORMAT macros

2017-02-20 12:16:15 +01:00

rbd.c

rbd: drop wait_for_latest_osdmap()

2019-03-20 16:27:40 +01:00

skd_main.c

block: kill BLK_MQ_F_SG_MERGE

2019-02-15 08:40:12 -07:00

skd_s1120.h

skd: Use __packed only when needed

2017-08-18 08:45:29 -06:00

sunvdc.c

block: sunvdc: don't run hw queue synchronously from irq context

2019-01-03 08:21:47 -07:00

swim3.c

block/swim3: Fix regression on PowerBook G3

2018-12-31 10:19:19 -07:00

swim_asm.S

m68k: mac - Add SWIM floppy support

2009-03-26 21:15:27 +01:00

swim.c

swim: convert to blk-mq

2018-10-16 09:49:18 -06:00

sx8.c

sx8: use a per-host tag_set

2018-11-09 08:14:14 -07:00

umem.c

block: remove the lock argument to blk_alloc_queue_node

2018-11-15 12:13:35 -07:00

umem.h

…

virtio_blk.c

virtio-blk: limit number of hw queues by nr_cpu_ids

2019-04-10 08:18:24 -06:00

xen-blkfront.c

block: kill BLK_MQ_F_SG_MERGE

2019-02-15 08:40:12 -07:00

xsysace.c

xsysace: Fix error handling in ace_setup

2019-04-06 10:51:12 -06:00

z2ram.c

powerpc updates for 4.20

2018-10-26 14:36:21 -07:00