Messages in this thread | | | From | Jose Luis Salas <> | Date | Fri, 2 Dec 2011 17:44:05 +0100 | Subject | System freezes with high network activity |
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Hello there,
I' ve filled a bug against linux kernel in Debian [1] for the linux-kernel-image 2.6.32.
The problem is that the system freezes ( no complete ) when high network activity occurrs, for example copying files over NFS or downloading files with Bittorrent.
When the system is frozen, there is no network connecivity, the console freezes ( with top program, for ex. ) until a key from the laptop is pressed or when network activity drops. The network throughtput also drops before the freeze.
I've also realized that clock drifts ( it's frozen too ) when the system is frozen.
This problem didn't occur in Linux kernel 2.6.26 ( from the Lenny release ), I think >2.6.26 are affected, but I need to confirm it ( >= 2.6.30 are included for sure ).
After investigating for a while ( tested noapic, noacpi and several switches with no luck.) , I've search for a solution and I finally found it. I think that the bug is caused by changes in the clocksource between kernels and the powernow-k8 module.
One time I tested booting the xen-patched the linux kernel and the problem dissapeared, the net worked at full speed but there was no cpu scaling.
Now, with recent kernels, I boot the kernel with the clocksource=jiffies option and the powersaved daemon to do the frequency scaling, the net works al full speed. With acpi_pm and tsc options doesn't work neither.
More information as acpidump output and dmesg are included in the [1] Debian bug too.
Thanks.
[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=583363
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