Messages in this thread | | | Date | Mon, 18 Apr 2016 20:53:53 +0800 | From | zhong jiang <> | Subject | A mainline question about cgroup writeback |
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cgroup writeback support the filesystem both ext4 and ext2. but, it appears to be not work when I test the function in the ext4. The example is as follows: echo "8:0 1048576" > blkio.throttle.write_bps_device echo $$ > cgroup.procs dd if=/dev/zero of=/test.c bs=1M count=10240 10240+0 records in 10240+0 records out 10737418240 bytes (11 GB) copied, 49.8796 s, 215 MB/s
Furthering test find that the ratelimit will be limited if it write data to disk directly. Additionly, The read ratelimit is limited whther it go through the page cache or not.
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