RE: raid0 low performance

[Ming Zhang <mingz@ele.uri.edu>]

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On Mon, 2005-07-04 at 20:13 -0400, Mark Hahn wrote:
> > # ./lspci -vv -d 11ab:
> > 02:01.0 Class 0100: 11ab:5081 (rev 03)
> >         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop-
> > ParErr- Stepping- SERR- FastB2B-
> >         Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
> > <TAbort- <MAbort- >SERR- <PERR-
> >         Latency: 32, cache line size 08
> 
> latency 32 is quite low; this parameter effects how long the device
> can hold onto the bus.  try
> 	setpci -s 02:01.0 latency_timer=80

thanks a lot for this and i will test it tomorrow.

> and see whether it improves things.  I'm unclear on whether a bridged device
> also needs the bridge's latency setting changed.
> 
> >         Latency: 32, cache line size 08
> 
> also low.  I'm guessing that your bios is tuned for desktop use - some audio
> setups need low latency settings.
> 
yes, i guess so, the only drawback of this box is that i am using a
entry level server box. so its chipset is quite weak and the setting i
left as default.


Ming


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