Messages in this thread | | | Date | Fri, 07 Nov 2003 00:05:59 +1100 | From | Nick Piggin <> | Subject | Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt |
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Jens Axboe wrote:
>On Thu, Nov 06 2003, Nick Piggin wrote: > >> >>Prakash K. Cheemplavam wrote: >> >> >>>>>procs -----------memory---------- ---swap-- -----io---- --system-- >>>>>----cpu---- >>>>>r b swpd free buff cache si so bi bo in cs us >>>>>sy id wa >>>>>2 0 0 579472 13976 308572 0 0 425 85 1255 645 5 >>>>>3 84 9 >>>>>2 0 0 579456 13976 308572 0 0 0 0 725 521 5 >>>>>5 91 0 >>>>>1 0 0 579448 13976 308572 0 0 0 0 736 523 2 >>>>>5 94 0 >>>>>0 0 0 579448 13976 308572 0 0 0 25 745 439 2 >>>>> >>>> >>>> >>>>[snip] >>>> >>>>This looks good, from a system utilization point of view. I'm wondering >>>>whether you have the iso image cached? There's no block io going on. >>>> >>>>It does like more like a CPU scheduler problem at this point. >>>> >>> >>> >>>Ok, then it is Nick's turn, I guess. :-) Yeah most probably the iso is >>>cached, as it was not the first time I burnt the iso when I did the >>>vmstat, furthermore I have 1 GB of RAM... The other thing which >>>doesn't speack for i/o problems, I guess: Just the first seconds when >>>I start erasing the CD-RW the mouse hangs and heavily stutters, then >>>it is OK until actual burning of image begins, then the mouse slightly >>>stutters. All this was not with test9-mm1. >>> >>> >>I don't think the scheduler is the problem if you didn't have these problems >>in mm1. The scheduler is quite good when nothing is reniced. Whats funny >>though is it looks like you're losing timer interrupts, this is a sign that >>something is holding interrupts off for too long, and would also cause >>problems with your mouse. >> > >sys time is usually pretty high if that is the case, and it's hovering >around 5% here... Prakash, are you sure that dma is enabled on the >drive? When you see the problem, do a vmstat 1 for 10 seconds so you are >absolutely sure you are sending the info from when the problem occurs. >
Although have a look at the interrupts field in vmstat 1255, 725, 736 ...
> >>I guess its over to Andrew. >> > >Back to you, Kent! :-) >
:)
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