Date: Wed, 4 Oct 1995 13:00:25 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, dyson@freefall.freebsd.org Cc: current@freebsd.org Subject: Re: lmbench 1.1.5 vs 2.2-current Message-ID: <199510040300.NAA09750@godzilla.zeta.org.au>
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>>The faster disk and clustering speed up the file reread benchmark by a >>factor of 8. >Yep, it is mostly the clustering, and the larger, on-demand, buffer cache. Actually it must be almost entirely due to the larger cache. My system can't do 8.6MB/sec except out of the cache. The test only reads up to 8MB. >... >>Otherwise, these benchmarks >>show unexplained lossages (probably mostly due to vfs bloat) of 10-40% >>for 2.2-current. >Interesting, the VFS code adds THAT much overhead to the TCP/UDP results??? >(Maybe, but I don't think so) Some of the networking latency must be for the extra context switch time caused by calling microtime() twice for every context switch (it should only be called once). I don't see how this could account for 100 usec extra. Bruce
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