Date: Fri, 26 Jan 1996 07:41:52 -0800 (PST) From: John Dyson <dyson> To: current Subject: Good news -- pipe stuff Message-ID: <199601261541.HAA09194@freefall.freebsd.org>
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I am in the process of creating a new pipe mechanism. Our pipes have been a bit slower than they should be, considering the simple functionality that they perform. The latest results that I get show significant performance improvements in both the Byte and lmbench benchmarks on pipe latency, pipe bandwidth, and pipe context switch. The stuff on my workstation includes this new code, and is isolated well enough that it is "theoretically" possible to include even into -stable (not likely though.) Pipe latency is about 2x the speed, pipe bandwidth is about 50% faster, and I am still evaluating the context switch -- but it is faster. Before I include the changes, I plan to add more intelligent memory management of pipes (including making them pageable -- instead of tieing up wired memory), and page-flipping. Page-flipping should add about 50% more onto the bandwidth. Anyway, the code is simpler than I had first thought that it would be, and should probably be ready for testing in the next week or so... John dyson@freebsd.org
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