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Date: Tue, 21 Dec 2010 12:52:05 +0300
From: Lev Serebryakov <lev@serebryakov.spb.ru>
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To: Eugene Grosbein <egrosbein@rdtc.ru>
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Cc: freebsd-net@freebsd.org
Subject: Re: E4500 spend one core to saturate 1Gbit/s link with TCP -- is it
	nornal?
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Hello, Eugene.
You wrote 21 =C4=C5=CB=C1=C2=D2=D1 2010 =C7., 9:19:46:


>>>>  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.
>>   simple  "iperf"  shows almost same load (slightly less, but it shows
>>   slightly less speed, about 800Mbit).
>>=20
> iperf is bad tool IMHO, it abuses gettimeofday() system call and wastes t=
oo much CPU time.
> Compare with ftpd that uses sendfile() kernel function.
  system  ftpd  twice  slower  (or  I can not find good FTP client for
  Windowsn  -- I've tried FAR, wget/cygwin and "native" ftp), but load
  is significally less.

  On  the  other  hand,  when I rebuilt kernelk wit DEVICE_POLLING and
  turned  polling  on,  load decrease to 10-15% of one core in case of
  samba :)

--=20
// Black Lion AKA Lev Serebryakov <lev@serebryakov.spb.ru>