Date: Tue, 21 Dec 2010 12:19:46 +0600 From: Eugene Grosbein <egrosbein@rdtc.ru> To: Lev Serebryakov <lev@serebryakov.spb.ru> Cc: freebsd-net@freebsd.org Subject: Re: E4500 spend one core to saturate 1Gbit/s link with TCP -- is it nornal? Message-ID: <4D104702.40208@rdtc.ru> In-Reply-To: <1647893939.20101220234453@serebryakov.spb.ru> References: <12810339411.20101220205327@serebryakov.spb.ru> <4D0FB1B1.7070703@rdtc.ru> <1647893939.20101220234453@serebryakov.spb.ru>
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On 21.12.2010 02:44, Lev Serebryakov wrote: > Hello, Eugene. > You wrote 20 декабря 2010 г., 22:42:41: > >>> 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). > iperf is bad tool IMHO, it abuses gettimeofday() system call and wastes too much CPU time. Compare with ftpd that uses sendfile() kernel function. Eugene Grosbein
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