On Fri, May 12, 2006 at 11:25:58PM +0300, Dmitry Pryanishnikov wrote: > > Hello! > > On Fri, 28 Apr 2006, Kris Kennaway wrote: > >>>>makeoptions CONF_CFLAGS=-fno-builtin > >I don't know, it needs to be tested in your particular case. > > I've built another kernel, adding back > > makeoptions CONF_CFLAGS=-fno-builtin > options QUOTA > > Results are almost the same as w/o these 2 options. So the following > overhead difference: > > >>>> %Sys %Intr %Idl > >>>>RELENG_6 + rl0 45 40 15 > >>>>RELENG_6 + fxp0 45 35 20 > > > >> %Sys %Intr %Idl "time md5 -t" wall clock time > >>RELENG_6 + rl0 34 24 42 1:43 > >>RELENG_6 + fxp0 30 20 50 1:40 > > is caused by just these: > > options INVARIANTS > options INVARIANT_SUPPORT
So what is the overall status? I am not clear what your results are. > As my transfer takes much time (say 10 minutes) I've observed % of time > used many times during the transfer - they don't vary more than +/- several > (2-3) % during the main transfer phase (when transfer speed is stable). > My "time md5 -t" runs was used only as a confirmation that systat's numbers > are trustworthy - they simply confirm that there are _much_ less CPU cycles > available for application under RELENG_5/6 than under RELENG_4 (under > identical load pattern). I ran "time md5 -t" several (3-5 times) just to > confirm my assumptions, and results didn't vary more than 3%. So I suppose > that ministat isn't necessary in my tests. Perhaps not when the difference is large, but you need to be very careful when differences are below ~10%, because it's easy to make incorrect conclusions. Kris
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