Re: high load, no bottleneck

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Wed, Sep 18, 2013 at 06:03:11PM +0200, Emmanuel Dreyfus wrote:
> Emmanuel Dreyfus <manu%netbsd.org@localhost> 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.

Thor