mps0-troubles

[Joachim Tingvold]

On Thu, Feb 03, 2011, at 23:10:56PM GMT+01:00, Kenneth D. Merry wrote:
> Try running this, and then do 'sysctl hw.mps' and let's see what  
> your low
> water mark is for free chain elements.  We'll also want to make sure  
> your
> chain_free value is about equal to MPS_CHAIN_FRAMES when the system is
> idle.  On my system with a LSI 9201-16i controller, I see:

While idle;

	[jocke at filserver ~]$ sysctl hw.mps.0
	hw.mps.0.debug_level: 0
	hw.mps.0.allow_multiple_tm_cmds: 0
	hw.mps.0.io_cmds_active: 0
	hw.mps.0.io_cmds_highwater: 53
	hw.mps.0.chain_free: 2048
	hw.mps.0.chain_free_lowwater: 2029
	hw.mps.0.chain_alloc_fail: 0

After I copied a 22G file from 'storage' to 'zroot';

	[jocke at filserver ~]$ sysctl hw.mps.0
	hw.mps.0.debug_level: 0
	hw.mps.0.allow_multiple_tm_cmds: 0
	hw.mps.0.io_cmds_active: 0
	hw.mps.0.io_cmds_highwater: 99
	hw.mps.0.chain_free: 2048
	hw.mps.0.chain_free_lowwater: 2029
	hw.mps.0.chain_alloc_fail: 0

After I copied a 22G file from 'zroot' to 'storage';

	[jocke at filserver ~]$ sysctl hw.mps.0
	hw.mps.0.debug_level: 0
	hw.mps.0.allow_multiple_tm_cmds: 0
	hw.mps.0.io_cmds_active: 0
	hw.mps.0.io_cmds_highwater: 897
	hw.mps.0.chain_free: 2048
	hw.mps.0.chain_free_lowwater: 2029
	hw.mps.0.chain_alloc_fail: 0

-- 
Joachim