E4500 spend one core to saturate 1Gbit/s link with TCP -- is it nornal?

[Eugene Grosbein]

On 20.12.2010 23:53, Lev Serebryakov wrote:

>  I have file server with Core2Duo E4500 CPU and Intel gigabit adapter
>  (82566DM).
> 
>  FreeBSD 8-STABLE (8.2-PRERELEASE #1: Fri Dec 3 2010) and
> samba35-3.5.6 are installed.
> 
>  This server could serve about 110MiB/s to one client over CIFS, but
> one core of CPU is completely busy in such situation: about 60% of CPU
> is occuped by "ketnel" and 35-40% occuped bu "smbd" accroding to "top
> -S" ouput.
> 
>  Is it normal, that 2.2GHz core is needed to saturate 1Gib link with
>  only one client (and one TCP connction), or I have something
>  misconfigured?

Compare with ftpd that uses sendfile() kernel function.

Eugene Grosbein