Re: [PATCH] fix for BZ 8426 - massive slowdown on SCSI CD/DVD drive connected to mptspi driver

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On Tue, 2007-05-22 at 14:25 -0600, Doug Chapman wrote:
> Eric,
> 
> Sorry to bother you on this again, I realize you are very busy.
> 
> >From our off-list email and from your comments to Chip Coldwell in
> redhat BZ 225177 it sounded like you were prepared to ACK this.  Any
> chance you could send your official ACK so this can be committed?
> 
> much appreciated,

Actually I'd like a little analysis of why first, please Eric.

It seems to me, with the current wrong ordering in the initialisation
results in a large queue depth being given to the DVD (which are
habitually very low queue depth ... or even untagged beasts).  So does
the slowdown result from the fusion accepting N commands for the DVD and
then rejecting N-1 of them resulting in ping pong between the mid-layer
and driver?

If so, we probably want to fix the command throttling in the driver.

James


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