Date: Mon, 21 Nov 2022 09:28:04 -0500 From: mike tancsa <mike@sentex.net> To: Ian Smith <smithi@nimnet.asn.au>, Kevin Oberman <rkoberman@gmail.com> Cc: questions@freebsd.org Subject: Re: RELENG_13 and min cpu frequency Message-ID: <4d970820-3c12-95eb-8ed8-2c3a3e08feb5@sentex.net> In-Reply-To: <5E64A5AC-3634-4336-B0A9-E98962D8BE79@nimnet.asn.au> References: <9d17ea30-4b10-2aa3-9d09-017da7423844@sentex.net> <BF5CF7F7-DBB3-45A5-9FFA-7595EF41D494@nimnet.asn.au> <CAN6yY1v59%2BUeHuOZBVeK%2BsN694u=xjA7CyXOiOMEXtkgZfYQFA@mail.gmail.com> <5E64A5AC-3634-4336-B0A9-E98962D8BE79@nimnet.asn.au>
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On 11/20/2022 2:37 PM, Ian Smith wrote: > Thanks Kevin. I went hunting through freebsd-acpi archives, and found your related comments in > > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264775 > > Seems we need some overview on what FreeBSD can and can't do regarding changing CPU speeds, or whether it's even appropriate to try doing so on these latest processors? > > I'm well behind; few years ago there wasn't even the concept of different cores running different frequencies. > > Maybe the best we can do with these is making sure that fans are up to keeping the system cool enough .. > > Not that this helps mike's problem with apparent packet loss, but it's hard to see if that may be related. > > cheers, Ian Hi Ian and Kevin, I was playing with a few little scripts to try and keep the core activity high, but its doesnt make sense as to why one thing is better than another. Doing something like dd if=/dev/urandon bs=1024k count=5 | sha512 does NOT seem to make too much of a difference in a loop. And doing sysctl -a dev.cpu. | grep freq seems to make the cpu stay higher / longer than the dd. Perhaps due to some kernel land vs userland calls. Not sure. ---Mike
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