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SubjectRe: PROBLEM: ide-cd in 2.6.8-2.6.10 and 2.4.26-2.4.28 high cpu use with dma
On Sun, Jan 09 2005, Hikaru1@verizon.net wrote:
> A minor mistake. I forgot to state explicitly that the problem only appears
> with writing audio cds. Writing data cds does not cause problems.

The change isn't safe, it was made for a reason since some drives
timeout if the alignment/length isn't correct. It probably is a little
pessimistic right now, can you see if this just works for you?

===== drivers/ide/ide-cd.c 1.105 vs edited =====
--- 1.105/drivers/ide/ide-cd.c 2005-01-08 06:43:53 +01:00
+++ edited/drivers/ide/ide-cd.c 2005-01-09 16:31:53 +01:00
@@ -1915,7 +1915,7 @@
/*
* check if dma is safe
*/
- if ((rq->data_len & mask) || (addr & mask))
+ if ((rq->data_len & 3) || (addr & mask))
info->dma = 0;
}

--
Jens Axboe

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