Re: GURU needed: Linux vs. FreeBSD

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 3 Nov 1998 21:14:48 +0000 (GMT)

> Linux uses far more cpu to move data to and from disk and to and from
> network connections than freebsd does.
>
> Simple test.
>
> 1)
> A = disk partition
>
> time dd if=A bs=32k of=/dev/null count=5000
>
> linux box will use 90% of the cpu, freebsd will use 2%
> [given a decent scsi system]

Benched with what. You can't use "time" - the kernel counting algorithms
for CPU utilisation are not equivalent.

> I find that for bulk tcp freebsd is about 20% leaner on the cpu usage
> also, so a given machine under freebsd can serv more requests per unit
> time before it's cpu saturates.

Benched with what.

> Given the above, I use linux for all my personal machines and Freebsd
> for busy servers.

All the benching Ive done says the opposite is true. The one freebsd wins
on is scsi throughput.

Alan

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