Date: Tue, 22 Nov 2022 16:36:25 +1100 From: Ian Smith <smithi@nimnet.asn.au> To: mike tancsa <mike@sentex.net>,Kevin Oberman <rkoberman@gmail.com> Cc: questions@freebsd.org Subject: Re: RELENG_13 and min cpu frequency Message-ID: <E2DE24CB-5D07-41BC-9D62-708902305E0B@nimnet.asn.au> In-Reply-To: <f5b51083-4bc4-2ee2-befd-b2356a781189@sentex.net> References: <9d17ea30-4b10-2aa3-9d09-017da7423844@sentex.net> <f5b51083-4bc4-2ee2-befd-b2356a781189@sentex.net>
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On 22 November 2022 6:08:02 am AEDT, mike tancsa <mike@sentex=2Enet> wrote: > On 11/18/2022 4:28 PM, mike tancsa wrote: > > I noticed that when I moved from an old RELENG11 to RELENG13 > firewall,=20 > > I was starting to get dropped packets=2E=C2=A0 Looking at when it was= =20 > > happening, it actually seems to happen at times where the network > load=20 > > is really low?!?!=C2=A0 When I see a high PPS or high bandwidth, I do= nt > get=20 > > overruns on the nic=2E=C2=A0 Trying to figure out whats going on, it = seems > to=20 > > correlate with when the CPU reduces its frequency to save on power=2E >=20 > > When its in turbo mode, it scales up to 4300, but then in the quiet >=20 > > hours, it goes down to 800 and that seems to be when I start > getting=20 > > the odd overrun=2E > OK, some possible progress=2E I noticed that >=20 > =C2=A0sysctl -a dev=2Ecpufreq=2E0=2Efreq_driver > dev=2Ecpufreq=2E0=2Efreq_driver: hwpstate_intel0 >=20 > Looking at the man page >=20 > dev=2Ehwpstate_intel=2E%d=2Eepp > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 Energy/Performance Preference=2E=C2=A0 Valid values range from > 0 to 100=2E > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 Setting this field conveys a hint to the hardware > regarding a > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 preference towards performance (at value 0), energy > efficiency > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 (at value 100), or somewhere in between=2E >=20 > it defaults to 50=2E=C2=A0 I changed the value to 5 >=20 > sysctl -w dev=2Ehwpstate_intel=2E0=2Eepp=3D5 >=20 >=20 > Looking at the freq value >=20 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 > dev=2Ecpu=2E0=2Efreq: 4410 >=20 >=20 > Should have a better sense in a couple of days >=20 > =C2=A0=C2=A0=C2=A0 ---Mike Ah, well=2E hwpstate_intel was new in 13, I had to read the man online=2E I guess you'll try various values from 0 to 100? Maybe this indicates where powerd or successors might move? I noticed also that you can turn it off at boot to perhaps re-engage est(4= ), or choose between the default package-level or per-cpu control, so ther= e's lots of scope for fine-tuning (or disastrous mismanagement :) You might find sysutils/stress helpful with tests; loading up N cpus and/o= r io and/or memory malloc/free, for specified lengths of time=2E It might be useful to record, say, cpu=2E0=2Etemperature with frequencies?= And maybe vm=2Eloadavg, if it's behaving itself these days =2E=2E=2E Ah, I really haven't the spare time to be this interested :) cheers, Ian > > CPU is CPU: Intel(R) Xeon(R) E-2226G CPU @ 3=2E40GHz (3400=2E00-MHz= =20 > > K8-class CPU)
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