Date: Wed, 4 May 2011 16:49:01 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: freebsd-stable@freebsd.org Subject: How to understand, what userland program does in kernel? Message-ID: <455293202.20110504164901@serebryakov.spb.ru>
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Hello, Freebsd-stable. I have userland program (transmission BT client), which spent 100% of one core of E4500 CPU when it has many peers. It is surprises me, as channel is only 35Mbit, and my "Linux" friends can upload much more on comparable hardware. But what surprises me even more, that 50% of this time it spends as System time. Is here any way to understand, what transmission does in kernel for so much time? It seems, that userland profiling doesn't help me, am I right? --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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