Date: Thu, 18 Sep 2008 20:27:30 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Jian Qiu <swordqiu@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: What's the status of parallel netisr? Message-ID: <48D2ABA2.8010703@FreeBSD.org> In-Reply-To: <e8520310809180750h41ddd3e9tb83f20953f1c8095@mail.gmail.com> References: <e8520310809151020j29b8870v3167cb2879e8543d@mail.gmail.com> <48CF6450.6020909@FreeBSD.org> <e8520310809160743v46b5cf18jd78f6043eaeccaa3@mail.gmail.com> <48D00899.4070908@FreeBSD.org> <e8520310809180750h41ddd3e9tb83f20953f1c8095@mail.gmail.com>
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Jian Qiu wrote: > Thanks again for the info. > > As you suggested, I did test on the most recent 7.0-stable-200807 kernel. > > The SMP throughout on the new kernel was improved to around 90MB/s. > > However, SMP kernel still had no advantage over UP, at least for this > kind of single threaded applications. > > I further did the same test on Linux with both SMP and UP. > > I did observe the same trend. > > The throughput on UP (~210MB/ecs) was also much better than SMP (~170MB/sec). > > However, I was surprised again that the local UDP throughput on Linux > was more than double of FreeBSD. > > Since all these tests were performed on the same machine, it must be > because of the kernel that made such big differences. > > I'm curious what is the major performance bottleneck in FreeBSD network stack?? > > Is there any plan in community to address these issues? In our application-level tests FreeBSD significantly out-performs Linux, so either you have found a different workload, or something is not configured equally. One important thing I can think of off the top of my head is that Linux has a larger socket buffer size by default, so try tuning that on FreeBSD or confirm they are equal. If that still fails, can you provide test code? Kris
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