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Crg
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Joined: 29 May 2002
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PostPosted: Sat Jan 10, 2004 7:09 pm    Post subject: Apache/Databases & kernel 2.6 performance. Reply with quote

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:
Code:
elevator=deadline

or
Code:
 elevator=cfq


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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PostPosted: Sat Jan 10, 2004 8:14 pm    Post subject: Reply with quote

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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Crg
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PostPosted: Sat Jan 10, 2004 11:40 pm    Post subject: Reply with quote

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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