On Sep 19, 6:41pm, m...@netbsd.org (Emmanuel Dreyfus) wrote: -- Subject: Re: high load, no bottleneck
| Greg Oster <os...@cs.usask.ca> wrote: | | > > sysctl to the rescue. | > | > The appropriate 'bit to twiddle' is likely raidPtr->openings. | > Increasing the value can be done while holding raidPtr->mutex. | > Decreasing the value can also be done while holding raidPtr->mutex, but | > will need some care if attempting to decrease it by more than the | > number of outstanding IOs. | | This suggests that in my problem, RAIDframe would be the bottleneck | given too many concurent I/O sent by WAPBL. But how is it possible? | Aren't WAPBL flushes serialized? | | The change you sugest would be set by raidctl rather than sysctl, right? I think so, because it should be per raid set and it should be persistent. christos
