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* [gentoo-user] Slow network transfers ... lost interrupts because of clocksource?
@ 2013-09-27 10:33 Stefan G. Weichinger
  2013-09-27 13:02 ` [gentoo-user] " Nicolas Sebrecht
  2013-09-27 15:55 ` [gentoo-user] " Volker Armin Hemmann
  0 siblings, 2 replies; 31+ messages in thread
From: Stefan G. Weichinger @ 2013-09-27 10:33 UTC (permalink / raw
  To: gentoo-user


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 ?

What direction to go? force or disable HPET?

-

btw I saw the same slowdown on 2 NICs: one connects the server to the
LAN via GB-switch, the other connects the 2 servers directly via
crossconnect-cable (dedicated for backups).

I tried rsync with various options, scp, and even some tar/netcat-combo ...

The system runs gentoo sources 3.10.7, amd64 ...

-

Thanks for any thoughts on this!

Stefan


^ permalink raw reply	[flat|nested] 31+ messages in thread

end of thread, other threads:[~2013-10-14 17:21 UTC | newest]

Thread overview: 31+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-09-27 10:33 [gentoo-user] Slow network transfers ... lost interrupts because of clocksource? Stefan G. Weichinger
2013-09-27 13:02 ` [gentoo-user] " Nicolas Sebrecht
2013-09-27 13:06   ` Stefan G. Weichinger
2013-09-27 13:18     ` Nicolas Sebrecht
2013-09-27 15:05       ` Stefan G. Weichinger
2013-09-27 15:55 ` [gentoo-user] " Volker Armin Hemmann
2013-09-29 14:37   ` Stefan G. Weichinger
2013-09-30  9:54     ` Stefan G. Weichinger
2013-09-30 17:07       ` Volker Armin Hemmann
2013-09-30 17:36         ` Stefan G. Weichinger
2013-09-30 17:44           ` Bruce Hill
2013-09-30 17:46           ` Bruce Hill
2013-09-30 17:50             ` Stefan G. Weichinger
2013-09-30 18:23         ` Stefan G. Weichinger
2013-09-30 20:03           ` Stefan G. Weichinger
2013-10-01  8:26             ` Stefan G. Weichinger
2013-10-01 12:32               ` [gentoo-user] " Nicolas Sebrecht
2013-10-01 14:00                 ` Stefan G. Weichinger
2013-10-01 19:21                   ` Stefan G. Weichinger
2013-10-09 14:53                     ` Stefan G. Weichinger
2013-10-09 18:20                       ` Nicolas Sebrecht
2013-10-09 19:17                         ` Stefan G. Weichinger
2013-10-09 19:57                           ` Volker Armin Hemmann
2013-10-09 20:05                             ` Stefan G. Weichinger
2013-10-09 20:40                               ` Stefan G. Weichinger
2013-10-09 22:11                                 ` Stefan G. Weichinger
2013-10-09 22:18                                   ` Stefan G. Weichinger
2013-10-10 12:20                                     ` Bruce Hill
2013-10-10 14:38                                       ` Stefan G. Weichinger
2013-10-14  6:23                                         ` Stefan G. Weichinger
2013-10-14 17:21                                           ` Volker Armin Hemmann

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