Date: Thu, 23 Mar 2006 11:12:24 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: interesting(?) data on network interrupt servicing Message-ID: <200603231112.26646.jhb@freebsd.org> In-Reply-To: <20060323003228.GA1983@tin.it> References: <20060322122906.A41691@xorpc.icir.org> <200603221545.13769.jhb@freebsd.org> <20060323003228.GA1983@tin.it>
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On Wednesday 22 March 2006 19:32, Paolo Pisati wrote: > On Wed, Mar 22, 2006 at 03:45:12PM -0500, John Baldwin wrote: > > This is going out to the I/O APIC and writing a bit to mask the > > interrupt until the handler has run. Is he using a kernel that > > has SMP enabled? If so, turning SMP off might make things > > slightly better. > > 7.x: > SMP is on, PREEMPTION if off You probably want preemption on to minimize latency. If this is a UP machine, you should turn SMP off. It might be interesting to compare using 7.x without APIC as well, since you are not using APIC on 4.x. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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