Date: Fri, 24 Sep 2004 08:03:03 +0200 From: Waldemar Kornewald <Waldemar.Kornewald@web.de> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: FreeBSD-net <freebsd-net@freebsd.org> Subject: Re: locking & iovecs Message-ID: <4153B897.9040807@web.de> In-Reply-To: <20040923211703.GA23574@odin.ac.hmc.edu> References: <4152A3E9.8080700@web.de> <20040923181605.GC25699@odin.ac.hmc.edu> <415339A1.6090905@web.de> <20040923211703.GA23574@odin.ac.hmc.edu>
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Brooks Davis wrote: >>Oh, now that we talk about alternatives: did you consider using iovecs >>instead of mbufs? Be Inc. said that BONE, the new netstack of BeOS (now >>Zeta), can handle huge amounts of data much better than mbufs because >>iovecs reduce the number of copies made when fragmenting...though, there >>has never been a real comparison. > > Rewriting the network stack to use an alternate method of storing > network data is a hugh undertaking. It's not an idea that's likely to > get any sort of traction in the project unless someone presented running > code and a massive performance improvement across the entire spectrum of > applications. Unless you mean splitting buffers up into TCP packets, > fragmentations is a network configuration bug in 99% of all cases. :) Sorry, that is no bug. :) Maybe we will try it after we get our code/port stable. As we will not port all of your protocols it should be less of a problem to change our stack. I can post the results here (in some years ;). >>>You can implement mutexes using semaphores, but semaphores tend to be a >>>more expensive since they are more expressive them mutexes. >> >>Using a benaphore instead would improve speed significantly and as you >>only use macros we can easily replace those with our benaphore code, is >>that really so simple? Sorry, I cannot believe that. :) > > Once GIANT is really gone, it may be nearly that easy. We're a ways > from that though. So, the code is not fully thread-safe yet (we want to drop GIANT)? Then, I misunderstood something. Will 5.3 be freed of GIANT? Bye, Waldemar Kornewald
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