Messages in this thread | | | Subject | Re: Linux 2.4.13-ac1 | Date | Fri, 26 Oct 2001 18:54:00 +0100 (BST) | From | Alan Cox <> |
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> simply because the <2.4.10 buffer cache layer wasn't able to do proper > readahead on the blkdev. Now we do readahead properly and so in turn > the the lack of media-change trust of the vfs shows up. So as far I can > tell the right fix have no influence on the blkdev in pagecache, but it > only consists in resurrecting the media-change detection with a > per-device bitflag whitelist. I cannot see other source of stalls across > a close/open cycle.
I'm not currently sure if the impact is from the cost of the page cache flushing or the invalidate/re-read it triggers. There probably are two or three seeks on the DVD if the data is invalidated so that would make sense.
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