On Sep 19, 8:13am, t...@panix.com (Thor Lancelot Simon) wrote: -- Subject: Re: high load, no bottleneck
| On Wed, Sep 18, 2013 at 06:03:11PM +0200, Emmanuel Dreyfus wrote: | > Emmanuel Dreyfus <m...@netbsd.org> wrote: | > | > > Thank you for saving my day. But now what happens? | > > I note the SATA disks are in IDE emulation mode, and not AHCI. This is | > > something I need to try changing: | > | > Switched to AHCI. Here is below how hard disks are discovered (the relevant raid | > is RAID1 on wd0 and wd1) | > | > In this setup, vfs.wapbl.flush_disk_cache=1 still get high loads, on both 6.0 | > and -current. I assume there must be something bad with WAPBL/RAIDframe | | There is at least one thing: RAIDframe doesn't allow enough simultaneously | pending transactions, so everything *really* backs up behind the cache flush. | | Fixing that would require allowing RAIDframe to eat more RAM. Last time I | proposed that, I got a rather negative response here. sysctl to the rescue. christos