Messages in this thread | | | Date | Sat, 27 Dec 2003 20:54:49 +0100 | From | Jean-Luc Fontaine <> | Subject | Re: IDE performance drop between 2.4.23 and 2.6.0 |
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Linus Torvalds wrote: | | On Sat, 27 Dec 2003, Jean-Luc Fontaine wrote: | |>I solved the problem in a very strange way. Note that the (b) disk |>performance only improves after readahead has been increased on another |>(c) drive! (the (c) drive performance was also increased by to 2.4 |>levels but is not shown here). I could reliably repeat this behavior |>after rebooting. |> |>Can any IDE expert explain it? | | | Looks like a bug. If you don't access hdc,
hdc is / for 2.6, whereas hdb is used for 2.4. So hdc was obviously accessed prior to this test.
| then the read-ahead on hdc | shouldn't matter. I wonder if the read-ahead code (either the setting or | the reading) gets the value from the wrong queue or something.
Or could this set something in the VIA chipset? I'll take a look in /proc/ide/via and report if needed.
Let me know if you need more tests to be run.
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