Bob Liu d4bf0065b7 xen/blkback: make pool of persistent grants and free pages per-queue ... Make pool of persistent grants and free pages per-queue/ring instead of per-device to get better scalability. Test was done based on null_blk driver: dom0: v4.2-rc8 16vcpus 10GB "modprobe null_blk" domu: v4.2-rc8 16vcpus 10GB [test] rw=read direct=1 ioengine=libaio bs=4k time_based runtime=30 filename=/dev/xvdb numjobs=16 iodepth=64 iodepth_batch=64 iodepth_batch_complete=64 group_reporting Results: iops1: After patch "xen/blkfront: make persistent grants per-queue". iops2: After this patch. Queues: 1 4 8 16 Iops orig(k): 810 1064 780 700 Iops1(k): 810 1230(~20%) 1024(~20%) 850(~20%) Iops2(k): 810 1410(~35%) 1354(~75%) 1440(~100%) With 4 queues after this commit we can get ~75% increase in IOPS, and performance won't drop if increasing queue numbers. Please find the respective chart in this link: https://www.dropbox.com/s/agrcy2pbzbsvmwv/iops.png?dl=0 Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>		2016-01-04 12:21:06 -05:00
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blkback.c	xen/blkback: make pool of persistent grants and free pages per-queue	2016-01-04 12:21:06 -05:00
common.h	xen/blkback: make pool of persistent grants and free pages per-queue	2016-01-04 12:21:06 -05:00
Makefile	xen/blkback: Squash vbd.c,interface.c in blkback.c and xenbus.c respectivly.	2011-04-20 11:57:59 -04:00
xenbus.c	xen/blkback: make pool of persistent grants and free pages per-queue	2016-01-04 12:21:06 -05:00