Re: [Xen-users] Xen 4.12 DomU hang / freeze / stall under high network/disk load

[Sarah Newman <srn@xxxxxxxxx>]

On 2/17/20 9:37 AM, Glen wrote:
> Anecdotal informational item for entertainment value only:
>
> I had said previously that I had loaded about 2.5TB of data onto my
> guest machine, and was testing by trying to rsync (and then tar'ing)
> all that data from the test guest to an external source.   I was
> running multiple jobs simultaneously to try to simulate the heavy load
> that was clearly causing my production machines to stall
>
> Under 4.12, my guests would crumple after 24-36 hours of this type of loading.
>
> Under 4.10, my guest has been up now for 68 hours and - after about 64
> hours, the above transfers *completed*.  This has never happened.  No
> guest under 4.12 has ever survived 4+ simultaneous transfers of 2.5TB
> of data since I encountered this problem.  They would all stall well
> before the transfers could complete.  In contrast, under 4.10, my same
> guest ran at (subjectively) about half the load average, and the
> transfers all completed, in their entirely, without any stalls.
4.10 + which kernel version, just to confirm?

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