On 01/05/2014 07:19 PM, Ken Moffat wrote: > On Sun, Jan 05, 2014 at 06:51:44PM +0100, Armin K. wrote: >> >> Now that I've built it as module, the microcode firmware seems to load >> just fine and I did notice something: >> >> dmesg output, early boot - before /sbin/init has been ran: >> >> [ 0.040548] perf_event_intel: PEBS disabled due to CPU errata, please >> upgrade microcode >> >> dmesg output, after udev has been started and it has loaded the >> microcode module: >> >> [ 10.471604] microcode: CPU0 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.720949] microcode: CPU0 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.722411] microcode: CPU0 updated to revision 0x28, date = 2012-04-24 >> [ 10.722486] microcode: CPU1 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.722555] microcode: CPU1 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.723511] microcode: CPU1 updated to revision 0x28, date = 2012-04-24 >> [ 10.723549] microcode: CPU2 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.723617] microcode: CPU2 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.724582] microcode: CPU2 updated to revision 0x28, date = 2012-04-24 >> [ 10.724596] microcode: CPU3 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.724631] microcode: CPU3 sig=0x206a7, pf=0x10, revision=0x25 >> [ 10.725553] microcode: CPU3 updated to revision 0x28, date = 2012-04-24 >> [ 10.725573] perf_event_intel: PEBS enabled due to microcode update >> [ 10.725673] microcode: Microcode Update Driver: v2.00 >> <tig...@aivazian.fsnet.co.uk>, Peter Oruba >> >> >> >> I don't know what PEBS is, but in this case, microcode update seems to >> enable it. >> > I knew it was something to do with kernel performance monitoring, > (i.e. instrumenting how long is spent in various parts of the code) > and eventually found it documented in > http://perfmon2.sourceforge.net/pfmon_intel_core.html : Precise > Event-Based Sampling. > > ĸen >
Thanks for that. I don't think it's useful to me but good to know. I was just answering to the question if microcode update enabled something ... Well, to be honest, till today I didn't know if it did :D -- Note: My last name is not Krejzi. -- http://linuxfromscratch.org/mailman/listinfo/blfs-dev FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
