Re: Severe netbsd-6 NFS server-side performance issues

[buhrow%lothlorien.nfbcal.org@localhost (Brian Buhrow)]

        hello.  I think it's not clear to me if the device you have is old or
new from the driver's perspective.  There's something called the quartz
interface, and if your device uses that, then it's new, and isn't
multithreaded.  It doesn't look like anyone has touched the NetBSD driver
in a substantial way since 2007, so it might be "new".  Anyway, just a
thought.
Since it "worked" and then stopped, it probably is a bit that got flipped
in the disks or the firmware that happened to be persistent.
-Brian

On May 31,  9:51am, Hauke Fath wrote:
} Subject: Re: Severe netbsd-6 NFS server-side performance issues
} At 22:55 Uhr -0700 30.5.2012, Brian Buhrow wrote:
} >Another thought I had while looking at the bug report for
} >Kern/46136.  What if you swap to something other than the raid controller?
} 
} The machine has 4 GB of RAM, and while it runs Netatalk and Samba besides
} nfsd, they're not taxed much. top(1) says
} 
} Memory: 2298M Act, 1131M Inact, 14M Wired, 25M Exec, 3384M File, 23M Free
} Swap: 1024M Total, 1024M Free
} 
} >     Also, I'm not sure about this, but it looks like the driver is
} >multithreaded with the older raid controllers, but with the newer ones,
} >it's not.  I'm not sure if the one you have qualifies as old or new from
} >the driver's perspective.
} 
} The controller bios is dated 2006 - I guess that qualifies as 'old'?  ;)
} 
} >Christoz's comments about async disks also seems worth looking at.  Any
} >chance to look at the mode pages for each disk?
} 
} Not from the controller bios - the configuration interface is one of the
} reasons (besides the support punting my questions) why I wouldn't buy LSI
} MegaRAIDs again. You can set the interface speed per disk, but IIRC it
} doesn't tell you what the disk actually negociates for.
} 
} But, as I said, you probably wouldn't see the bonnie performance from disks
} running async.
} 
}       hauke
} 
} 
} --
} "It's never straight up and down"     (DEVO)
} 
} 
>-- End of excerpt from Hauke Fath