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On Mon, 8 Apr 2002, Anssi Saari wrote: > [1.] One line summary of the problem: > CD burning at 16x uses excessive CPU, although DMA is enabled That's a hint things are not working as you expect... > [2.] Full description of the problem/report: > My system seems to use a lot of CPU time when writing CDs at 16x. The > system is unable to feed the burning software's buffer fast enough when > burning software (cdrecord 1.11a20, cdrdao 1.1.5) is run as normal user. > If run as root, system is almost unresponsive during the burn. With all the information you provided, you have totally not quatified how much CPU you find "excessive." I would not be surprised to see 10-15% of the CPU, virtually all in system time, as a normal burn of an ISO image. If the time is in user mode with other image types, it may well be that you are doing something which actually requires a lot of CPU (byte swapping or some such). Going from a disk to a CD using DMA on both should not take much *system* CPU, even if these are ATAPI (assuming they are not on the same cable). -- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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