Messages in this thread | | | Date | Fri, 2 Apr 2004 11:56:01 -0800 | From | Andrew Morton <> | Subject | Re: 2.6.5-rc3-mm4 |
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markw@osdl.org wrote: > > I reran DBT-2 to with ext2 and ext3 (in case you were still interested) > on my 4-way Xeon system with 60+ drives: > http://developer.osdl.org/markw/fs/dbt2_project_results.html > > Aside from the from the drop you're already aware of since 2.6.3, it > looks like DBT-2 takes another smaller hit after 2.6.5-rc3-mm2. Here's > a brief summary from the link above:
The profile is interesting:
3671973 poll_idle 63309.8793 77750 __copy_from_user_ll 637.2951 64788 generic_unplug_device 487.1278 62968 DAC960_LP_InterruptHandler 336.7273 53908 finish_task_switch 361.7987 52947 __copy_to_user_ll 441.2250 29419 dm_table_unplug_all 439.0896 25947 __make_request 17.9938 18564 dm_table_any_congested 199.6129 13785 update_queue 104.4318 13498 try_to_wake_up 20.3590 12736 __wake_up 114.7387 12560 kmem_cache_alloc 163.1169 12221 .text.lock.sched 40.7367
- There's a ton of idle time there.
- The CPU scheduler is hurting. Nick and Ingo are patching up a storm to fix a similar problem which Jeremy Higdon is observing at 200,000 IOs/sec. This will get better.
- That 60-disk LVM array is costing us in the new unplug and congestion code. Jens, didn't you have a tune-up for that in the works?
- I'm surprised that you didn't see big gains from ext3-fsync-speedup, even though it appears that the test uses fdatasync().
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