Hi, These are some patches I'm testing to improve raid5-cache performance. The basic idea is to flush a lot of stripes to raid disks and then do smart scheduling of IOs. In my test of a 12-disk raid6 array, this improves around 20% throughput and request size/disk seek are improved a lot. fio script I'm using are: [global] ioengine=libaio direct=1 loops=1000 runtime=120 time_based=1 file_service_type=random:36 overwrite=1 thread=0 group_reporting=1 [test] filename=/dev/md0 bs=4k readwrite=randwrite numjobs=8 offset_increment=10G -------------------------------------------- Shaohua Li (3): md/raid5: prioritize stripes for writeback md/raid5-cache: bump flush stripe batch size md/raid5: sort bios drivers/md/raid5-cache.c | 2 +- drivers/md/raid5.c | 189 ++++++++++++++++++++++++++++++++++++++--------- drivers/md/raid5.h | 13 +++- 3 files changed, 169 insertions(+), 35 deletions(-) -- 2.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
