Bug#925496: Problem comes back with "EPU Power Saving Mode" enabled in the BIOS
Control: reopen -1
Control: found linux/4.19.28-2
Control: tags upstream
I wrote:
> However, this inspired me to check the BIOS version on the Asus H87M-E
> motherboards we're using. Both were using the rather ancient version
> 1001. I upgraded one machine to the latest version 2201 and the problem
> went away, even with the Debian stock 4.19.0-4-amd64 (4.19.28-2) kernel.
I spoke to soon. Upgrading the BIOS didn't work on the other afflicted
machine.
It turns out that on the machine that worked the BIOS "EPU Power Saving
Mode" setting was set to "Disabled". Changing this to "Enabled" (as is done
by the "ASUS Optimal" setting on the BIOS front page) causes the high
packet latency problem to return.
I've sent an email[1] to the netdev mailing list describing the problem,
but afterwards I discovered that someone else has also reported[2] what
looks like the same problem.
Mike.
[1] https://lore.kernel.org/netdev/20190327150546.dgt54rchfumhaap5@mcrowe.com/T/#u
[2] https://lore.kernel.org/netdev/CAMLO_R7Q6QCr7KX5goOvJ_BzDLU_tnw3UkMKzwDmL4C2BHubVA@mail.gmail.com/
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