Re: [PATCH] speed up SATA

[Eric D. Mudama]

On Sun, Mar 28 at 15:12, Jeff Garzik wrote:
> Over and above the barrier issue, the general problem of "OS doesn't 
> know precisely what's on the platter" leads to a nasty edge case:
>
> If an error occurs where the typical resolution is a bus or device 
> reset, cached writes that have been acknowledged to the OS but not yet 
> hit the media will likely be lost.  This seems to be worse in SATA, 
> where you have a new class of errors (SATA link up/down, etc.) that is 
> also typically dealt with via reset.
>
> 	Jeff

This shouldn't be the case.

We'll always complete writes we've given good status for prior to
saying "ok" on an incoming reset.  Hard or soft, all resets wait on a
clean internal cache before we process the reset itself.

--eric


--
Eric D. Mudama
edmudama@xxxxxxxxxxxxxxxxxxxxx

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/