Messages in this thread | | | From | "Felipe Alfaro Solana" <> | Date | Thu, 27 Feb 2003 23:24:40 +0100 | Subject | anticipatory scheduling questions |
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Hello,
I have just installed 2.5.63-mm1 on my system and have been performing a very simple benchmarks. Here are my first results when compared against a RedHat 2.4.20-2.54 kernel:
(All times expressed as total times)
1. time dd if=/dev/zero of=/tmp/p bs=1024k count=256 2.5.63-mm1 -> 0m12.737s 2.4.20-2.54 -> 0m17.704s
2. time cp /tmp/p /tmp/q 2.5.63-mm1 -> 0m41.108s 2.4.20-2.54 -> 0m51.939s
3. time cmp /tmp/p /tmp/q 2.5.63-mm1 -> 1m7.349s 2.4.20-2.54 -> 0m58.966s
4. time cmp /dev/zero /tmp/q 2.5.63-mm1 -> 0m17.965s 2.4.20-2.54 -> 0m14.038s
The question is, why, apparently, is anticipatory scheduling perfomring worse than 2.4.20? Indeed, this can be tested interactively with an application like Evolution: I have configured Evolution to use 2 dictionaries (English and Spanish) for spell checking in e-mail messages. When running 2.4.20, if I choose to reply to a large message, it only takes a few seconds to read both dictionaries from disk and perform the spell checking. However, on 2.5.63-mm1 the same process takes considerably longer. Any reason for this?
Thanks!
Best regards,
Felipe Alfaro Solana
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