Distribution: Gentoo, kernel 2.6.8 Hardware Environment: BENQ cd recorder Software Environment: cdrecord Problem Description: When i burn a audio cd with cdrecord my computer goes to a crawl using 100% of cpu and burning the cd takes like 15minutes on a burner that does 48X burning. Im using IDE burning like dev=ATA:1,0,0. This only happens with cdrecord, and not with cdrdao. Im having this problem since this kernel, with older kernels i didnt had this. I tried some 2.6.9-rc's and the problem is still there. Steps to reproduce: Burn an audio cd with cdrecord
Maybe this? http://kerneltrap.org/node/view/3659
I suppose that this bug is not related to the memory leak of kernel 2.6.8. There are several posts of users having problems burning audio CDs at high speed: http://bugs.kde.org/show_bug.cgi?id=95509 http://sourceforge.net/mailarchive/forum.php?thread_id=6260166&forum_id=1927 http://bugs.gentoo.org/show_bug.cgi?id=63040 What I would say after collecting the information from these posts: When burning audio CDs in TAO or DAO/SAO mode, the kernel uses much CPU time in hardware interrupts (~50% on an AMD 2200+ burning at 10x speed). The problem exists in kernels 2.6.7 and 2.6.9. If Jeff (Gentoo bug) is right and has the same problem, it does not appear in 2.6.5. Burning an audio CD in raw mode instead of DAO does not cause the problem. I can reproduce the problem myself with Gentoo's 2.6.9-r13 and cdrecord 2.01.
Just tested with 2.6.10-gentoo-r2 -> no change.
I can confirm this problem with debian testing from Jan 26th,2005 and the debian 2.6.8 kernel. Burning audio cds results in about 50% cpu consumption for hardware interrupts (according to top) on an 8x burner. Burning the audio CD in RAW mode works fine.
Can you reproduce it with modern kernels?
No. Seems to be solved already. I just retested with 2.6.17, but I remember that I could not reproduce the problem with an earlier version.
ok, so I'm closing it