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Re: kernel/4613: Slow SATA performance with nForce4 on amd64



The following reply was made to PR kernel/4613; it has been noted by GNATS.

From: Jonathan Gray <jsg_(_at_)_goblin_(_dot_)_cx>
To: Stuart Henderson <stu_(_at_)_spacehopper_(_dot_)_org>
Cc: gnats_(_at_)_openbsd_(_dot_)_org
Subject: Re: kernel/4613: Slow SATA performance with nForce4 on amd64
Date: Sun, 2 Apr 2006 12:14:35 +1000

 On Sun, Feb 05, 2006 at 12:30:02PM -0700, Stuart Henderson wrote:
 > The following reply was made to PR kernel/4613; it has been noted by GNATS.
 > 
 > From: Stuart Henderson <stu_(_at_)_spacehopper_(_dot_)_org>
 > To: Jonathan Gray <jsg_(_at_)_goblin_(_dot_)_cx>
 > Cc: gnats_(_at_)_openbsd_(_dot_)_org
 > Subject: Re: kernel/4613: Slow SATA performance with nForce4 on amd64
 > Date: Sun, 5 Feb 2006 19:20:25 +0000
 > 
 >  > Is there something eating all your interrupts perhaps?
 >  > What does looking at the output of "systat vmstat" for a while
 >  > reveal?
 >  
 >  I have a customer's DL145G2 I have been able to do a little testing
 >  with. The only significant interrupts are bge1/pciide1 (it's shared),
 >  around 100/sec (bge1 about 3-5/sec more than pciide1 according to
 >  systat vmstat).
 >  
 >  Disabling the nic doesn't help, and the BIOS has exactly one SATA-
 >  related knob: ON/OFF!
 >  
 >  top shows dd is mostly sleep/biowait, with low cpu use (93%-99.8%
 >  idle, 0.2%-0.6% interrupt, 0%-6.2% system). As you might expect
 >  the system is fairly unresponsive when this happens.
 >  
 >  I couldn't find a newer bios on hp.com. I've tried these kernels:
 >  
 >  amd64 GENERIC, GENERIC.MP from source check-out ~24h ago
 >  amd64 GENERIC, GENERIC.MP latest snapshot
 >  i386 GENERIC, GENERIC.MP latest snapshot
 >  
 >  I didn't see a difference between the kernels.
 >  
 >  Can you think of anything else to try while I've got the box
 >  available? (it won't be here for long, unfortunately).
 
 If you still have such a machine around:
 
 atactl wd0
 
 Might provide some insight.  I have seen multiple nforce4 machines
 running SATA disks not have any of these issues.