I did a really quick test: bonnie++ [0] on a SunV40z, 16GB RAM with CONFIG_TASK_DELAY_ACCT=y and another test with nodelayacct: http://nerdbynature.de/bits/LP-532490/
AFAICT bonnie++ was slightly faster with nodelayacct for ext4, but slightly slower for btrfs. Latencies seem to be slightly lower (good!) for nodelayacct, but not always. I could not really find out a winner here. Maybe if you squint in the right way one may see something else. Given that, I still think that TASK_DELAY_ACCT=y is really important to have. Just look around: every time "disk I/O + Linux + performance" comes up, one is advised to use iotop. It'd good if Ubuntu would provide the envrionment for such analysis. Thanks, Christian. [0] Yeah, I know. If anyone has an actual usecase where the performance hit for TASK_DELAY_ACCT=y vs. TASK_DELAY_ACCT=n can be seen, please let me know! -- CONFIG_TASK_DELAY_ACCT not enabled in kernel https://bugs.launchpad.net/bugs/532490 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
