lkml.org 
[lkml]   [2011]   [Jul]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 1/4] perf, x86: Add Intel Nehalem/Westmere uncore pmu
From

>
>> But it's not strictly required I would say,
>> 44(?) bits are probably enough for near all use cases.
>
> 44bits is in the hours range for pure cycle counts, which is so-so. I
> bet you're going to be very annoyed when you find your counters are
> wrecked after your 5 hour test run finishes.

For these kinds of long running measurements you usually care about
ratios, not absolutes. Some infrequent wrapping should not substantially
change.
those.

-Andi



\
 
 \ /
  Last update: 2011-07-05 18:03    [W:0.063 / U:3.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site