* Re: [gentoo-user] Slow network transfers ... lost interrupts because of clocksource?
@ 2013-09-27 15:55 99% ` Volker Armin Hemmann
0 siblings, 0 replies; 1+ results
From: Volker Armin Hemmann @ 2013-09-27 15:55 UTC (permalink / raw
To: gentoo-user
Am 27.09.2013 12:33, schrieb Stefan G. Weichinger:
> I am back from my visit at a customer where I installed a new and shiny
> gentoo server for running VMs (KVM).
>
> Currently I don't have access as my VPN only works from my static IP at
> home (my router seems to be offline right now ... and I am still away
> from office for the weekend) so I can't check details now ...
>
> basically:
>
> I tried to copy/rsync some file with ~8GB over a gigabit connection ...
> from old to new server. Checked ethtool for gigabit, looked ok. I always
> saw the behavior that the transfer started rather fast and slowed down
> within minutes. Let's say ~50 MB/s in the start and then down to maybe 2
> or so. That is way from the expected throughput with such new hardware.
>
> The NICs in the new server are BCM-something, Broadcom, using the tg3
> Tigon module (exact model not available right now as mentioned above).
>
> In "dmesg" I see lines like
>
> hpet1: lost 1 rtc interrupts
>
> which makes me wonder if that leads to the lousy performance (btw, I
> fear slow virtualization performance as well).
>
> Dealing with HPET I checked for kernel support and also added kernel
> options to GRUB:
>
> hpet=force clocksource=hpet
>
> which lead to
>
> # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> hpet
>
> I am unsure if I should further investigate things around this HPET-issue?
>
> My thinkpad here shows "tsc" as clocksource ... good/better ?
faster, if it works. Completely broken, if it doesn't.
> What direction to go? force or disable HPET?
>
>
neither
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2013-09-27 10:33 [gentoo-user] Slow network transfers ... lost interrupts because of clocksource? Stefan G. Weichinger
2013-09-27 15:55 99% ` Volker Armin Hemmann
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