Hello.
Bartlomiej Zolnierkiewicz wrote:
On Feb 20, 2007, at 5:44 PM, Bartlomiej Zolnierkiewicz wrote:
On Wednesday 21 February 2007 02:19, Suleiman Souhlal wrote:
It can be changed via /proc/ide/hd?/settings.
Why do we need to change IDE DMA timeout dynamically?
I've used it to test error recovery (for example).
Seems quite useable for developers but I would prefer not to
expose it in production kernels for end users.
It seems that I have counter example of a customer asking if this timeout
can be done configurable. :-)
May I ask what was the rationale for this request?
Their system seems to become unschedulable for this period of time (DMA
timeouts happen from time to time) -- at least the keepalive daemon stopped
replying during this period...
I have no strong feelings about adding this /proc/ide/ setting but I worry
that it could be (mis)used just to (unreliably) work-around problems...
BTW, why the timeout is so damn long? 2*WAIT_CMD is 20 secs, and if DMA is
not complete or interrupt pending, it may wait 10 more secs...
I really don't remember... :)
Maybe Mark or Alan could help with figuring this out.
They also have probably forgotten. :-)
Thanks,
Bart
MBR, Sergei
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