Date: Mon, 14 Oct 2002 19:59:32 +0200 From: Andre Oppermann <oppermann@pipeline.ch> To: freebsd-net@freebsd.org, freebsd-isp@freebsd.org Subject: Statistical Email Message Size Distribution Message-ID: <3DAB0604.7E780B3B@pipeline.ch>
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The first numbers of the Swiss Internet Analysis performed by Olivier Mueller and Daniel Graf are available. The whole study will be available in November 2002. Here is the statistical message size distribution of email messages observed in the analysis. These numbers are very important to find the right parameters for the filesystem the message store resides on. For example you have to tune the block size, fragment size and inode to block ratio to hold so many small files. We see that in total 49.3% of all messages are 4KB or smaller and that 80% are smaller than 16KB. 11% are between 17 and 64KB big. Almost 97% are smaller than 512KB. up to 2KB 23.53% up to 4KB 25.64% up to 8KB 18.43% up to 16KB 11.98% up to 32KB 5.78% up to 64KB 5.11% up to 128KB 2.83% up to 256KB 2.44% up to 512KB 1.50% up to 1MB 1.25% up to 10MB 1.47% more 10MB 0.0054% For these numbers 13.97 million messages flowing through the five largest Swiss ISPs in the first week of September 2002 have been analysed. So these numbers clearly apply to an ISP environment. -- Andre Oppermann To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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