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

[Lev Serebryakov]

Hello, Freebsd-net.

 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?

-- 
// Black Lion AKA Lev Serebryakov <lev at serebryakov.spb.ru>