Date: Tue, 26 Dec 2017 16:18:20 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: FreeBSD Stable <freebsd-stable@FreeBSD.org> Cc: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: idprio(1) broken Message-ID: <5A4213DC.20508@grosbein.net> In-Reply-To: <5A421212.4040703@grosbein.net> References: <5A421212.4040703@grosbein.net>
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On 26.12.2017 16:10, Eugene Grosbein wrote: > Is idprio(1) broken in stable/11? > > As root, start one bzip2 instance with idprio and one additional bzip2 intance per CPU core: > > # idprio 5 bzip2 -9 </dev/zero >/dev/null & > # n=$(sysctl -n kern.smp.cpus) > # i=1; while [ $i -le $n ]; do bzip2 -9 </dev/zero >/dev/null & i=$(($i+1)); done > # top > > For dual core system, I see that idprio'd bzip2 takes all cycles of first core > and two "normal" bzip2's share cycles of second core each taking ~50% of CPU time. > > It is expected that idprio'd bzip2 get no CPU time at all and each of "normal" bzip2's > get ~100% of single CPU core for such setup. This works as expected for stable/10.
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