Re: Normal buildtime for a kernel?
On Wed, 23 Mar 2005, Oliver.Korpilla@gmx.de wrote:
Well, but more than a half of the compile time up to 2/3rds account to system
time, which I think is somewhat excessive.
Maybe it's not processor related, but to the disk driver? Any way to find
out?
Have a look at whether DMA is enabled in the disk driver you are using. If
not, high disk throughput will cost you a lot of CPU power. You can find
out by looking at the kernel messages at boot, for example on one of my
boxes I see lines like
ata1: SATA max UDMA/133 cmd 0xFFFFFF0000004200 ctl 0xFFFFFF0000004238
bmdma 0x0 irq 18
which tells me that my serial ata disk is capable of (and using) dma.
Another thing which may make a difference is the io-scheduler you are
using, if your computer is heavily loaded with other disk-intensive tasks
when you are compiling your kernel (e.g. some cron jobs run extensive find
commands). Be sure to compile the as or cfq io scheduler(s) in your kernel
(or as modules) and to pass the "elevator=as" or "elevator=cfq" arguments
to your kernel boot sequence, this may help.
Bye
Giacomo
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Giacomo Mulas <gmulas@ca.astro.it>
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