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/[email protected]/T/#u [2] https://lore.kernel.org/netdev/camlo_r7q6qcr7kx5goovj_bzdlu_tnw3ukmkzwdml4c2bhu...@mail.gmail.com/
