Date: Wed, 17 Oct 2007 11:01:02 +0200 From: "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de> To: Bengt Ahlgren <bengta@sics.se> Cc: freebsd-current@freebsd.org, freebsd-stable@freebsd.org Subject: Re: SCHED_4BSD in RELENG_7 disturbs workflow Message-ID: <4715CF4E.6010203@gmx.de> In-Reply-To: <uh7tzoq9kts.fsf@P142.sics.se> References: <47150D87.3070804@gmx.de> <uh7tzoq9kts.fsf@P142.sics.se>
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Bengt Ahlgren wrote: > "[LoN]Kamikaze" <LoN_Kamikaze@gmx.de> writes: > >> From my perspective scheduling on RELENG_6 was way better. Even on a full >> workload like a portupgrade the focused application (both in X and on the >> console) always received enough cycles to run smoothly and applications that >> ran in background like audio players also kept on running fine. >> >> Quite the contrary on RELENG_7. During a portupgrade or even worse 'pkgdb -L' >> (recovering lost dependencies) audio players (both graphical and mplayer) >> scatter, either because they don't get the hard-disk or CPU-cycles (which one, >> I don't know) and the focused application also often hangs. It just looks like >> occasionally (under load) everything freezes for a second and then goes on >> relatively normal. > > Do you have ATA write-caching on or off? My experience is that if you > turn caching off (on RELENG_6_x at least, have not tried 7) the > machine often freezes for seconds when you are writing a lot to the > disk. > > Bengt > Write-caching is on on my machines.
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