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Crg
Guru
Joined: 29 May 2002
Posts: 345
Location: London
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 Posted: Sat Jan 10, 2004 7:09 pm Post subject: Apache/Databases & kernel 2.6 performance. |
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If you're running a webserver or a database on kernel 2.6 you'll probably find it is slower than 2.4. To correct this you should change your io scheduler to either deadline or cfq.
With the anticipatory scheduler (which is the default in 2.6) I saw a drop in an apache/mysql web app of almost 50%.
To change scheduler append:
or
to either grub or lilo.
cfq is not in the vanilla kernel - it is in the mm series or you can patch it in. |
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pjp
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Joined: 16 Apr 2002
Posts: 20067
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| Posted: Sat Jan 10, 2004 8:14 pm Post subject: |
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Interesting. I just read an article on the scheduler in Linux Journal. I thought I read that deadline was the default.
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Quis separabit? Quo animo? |
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Crg
Guru
Joined: 29 May 2002
Posts: 345
Location: London
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| Posted: Sat Jan 10, 2004 11:40 pm Post subject: |
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| pjp wrote: | | Interesting. I just read an article on the scheduler in Linux Journal. I thought I read that deadline was the default. |
Doesn't seem to be. 
vanilla linux-2.6.1/driver/block/Kconfig.iosched
| Code: | config IOSCHED_AS
bool "Anticipatory I/O scheduler" if EMBEDDED
default y
---help---
The anticipatory I/O scheduler is the default disk scheduler. |
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