From: Eric Dumazet <eric.dumazet@gmail.com>
To: Andrew Hendry <andrew.hendry@gmail.com>
Cc: Jesper Dangaard Brouer <jdb@comx.dk>, netdev <netdev@vger.kernel.org>
Subject: Re: Loopback performance from kernel 2.6.12 to 2.6.37
Date: Tue, 09 Nov 2010 07:42:13 +0100 [thread overview]
Message-ID: <1289284933.2790.91.camel@edumazet-laptop> (raw)
In-Reply-To: <1289284715.2790.87.camel@edumazet-laptop>
Le mardi 09 novembre 2010 à 07:38 +0100, Eric Dumazet a écrit :
> Hmm, your clock source is HPET, that might explain the problem on a
> scheduler intensive workload.
>
And if a packet sniffer (dhclient for example) makes all packets being
timestamped, it also can explain a slowdown, even if there is no
scheduler artifacts.
cat /proc/net/packet
> My HP dev machine
> # grep . /sys/devices/system/clocksource/clocksource0/*
> /sys/devices/system/clocksource/clocksource0/available_clocksource:tsc hpet acpi_pm
> /sys/devices/system/clocksource/clocksource0/current_clocksource:tsc
>
> My laptop:
> $ grep . /sys/devices/system/clocksource/clocksource0/*
> /sys/devices/system/clocksource/clocksource0/available_clocksource:tsc hpet acpi_pm
> /sys/devices/system/clocksource/clocksource0/current_clocksource:tsc
>
next prev parent reply other threads:[~2010-11-09 6:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1288954189.28003.178.camel@firesoul.comx.local>
[not found] ` <1288988955.2665.297.camel@edumazet-laptop>
[not found] ` <1289213926.15004.19.camel@firesoul.comx.local>
[not found] ` <1289214289.2820.188.camel@edumazet-laptop>
2010-11-08 15:06 ` Loopback performance from kernel 2.6.12 to 2.6.37 Eric Dumazet
2010-11-09 0:05 ` Andrew Hendry
2010-11-09 5:22 ` Eric Dumazet
2010-11-09 6:23 ` Eric Dumazet
2010-11-09 6:30 ` Andrew Hendry
2010-11-09 6:38 ` Eric Dumazet
2010-11-09 6:42 ` Eric Dumazet [this message]
2010-11-09 13:59 ` Jesper Dangaard Brouer
2010-11-09 14:06 ` Eric Dumazet
2010-11-09 14:16 ` Jesper Dangaard Brouer
2010-11-09 14:25 ` Eric Dumazet
2010-11-18 13:52 ` Eric Dumazet
2010-11-18 17:41 ` Eric Dumazet
2010-11-18 17:48 ` David Miller
2010-11-09 14:38 ` Jesper Dangaard Brouer
2010-11-10 11:24 ` Jesper Dangaard Brouer
2010-12-12 15:48 ` Arnaldo Carvalho de Melo
2010-11-09 21:35 Xose Vazquez Perez
2010-11-10 8:49 ` Jesper Dangaard Brouer
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