This bug has been dormant for a while with no update. I'm marking it as
won't fix. If this is still and issue, please re-open this bug.
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/1815178
Title:
18.04: Raid performances on kernel 4.15 and newer are suboptimal when
used on NVMe devices
Status in linux package in Ubuntu:
Won't Fix
Bug description:
Hello,
We have been running multiple tests using the md driver to build various type
of RAID devices. Performances on RAID5 are particularly disappointing so we
would like to know if there are any known issue with the md driver on Bionic
kernels. Here are some of our results :
Test (Threads) QCT JBODQCT RAID5 (8 threads) QCT RAID10
read(1) 838 751 (-10%) 572 (-32%)
read(2) 1226 1172 (-4%) 1057 (-14%)
read(4) 1129 2006 (+78%) 1760 (+56%)
write(1) 804 382 (-52%) 398 (-50%)
write(2) 1047 175 (-83%) 667 (-36%)
write(4) 883 415 (-53%) 871 (-1%)
randread(1) 863 749 (-13%) 619 (-28%)
randread(2) 1346 1067 (-21%) 1020 (-24%)
randread(4) 1648 1785 (+8%) 1650 (=)
randwrite(1) 766 287 (-63%) 391 (-50%)
randwrite(2) 1044 313 (-70%) 664 (-36%)
randwrite(4) 916 282 (-69%) 885 (-3%)
We are preparing tests with one of the latest mainline kernel.
TIA,
...Louis
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