Messages in this thread |  | | Date | 24 Sep 2001 11:13:15 -0000 | From | "Rico Tudor" <> | Subject | 2.4.10 cdrom readahead botch |
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Reading within 160 KB of the end-of-track causes pandemonium.
For those unfamiliar with CDROM media, reading past end-of-track (in TAO recordings) triggers a hard error from the drive. For SAO, the error occurs at the end of the last track of the session.
Through 2.4.9, Linux readahead is about 2 sectors, error recovery takes a second, and DMA settings are preserved. Even that readahead glitch can be avoided by lightly padding the end of a track during a burn.
CDROM support in 2.4.10 has taken a giant step into the toilet, and effectively breaks existing CDROMs. Reading within 80 CDROM sectors causes a boatload of error messages, minutes of delay, ATAPI resets, loss of DMA settings. I count 15 ATAPI resets when there should be 0. - 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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