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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: Instant chats and central servers
-- Jason Slagle - CCNP - CCDP Network Administrator - Toledo Internet Access - Toledo Ohio - [email protected] - [email protected] - WHOIS JS10172 /"\ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \ / ASCII Ribbon Campaign . If dreams are like movies then memories X - NO HTML/RTF in e-mail . are films about ghosts.. / \ - NO Word docs in e-mail . - Adam Duritz - Counting Crows On Wed, 9 May 2001, David Schwartz wrote: > > > No. > > > > I don't see how that can be. A P3-600 can RC4 encrypt over 60MB/sec in 64 > byte blocks. That figure drops to only 45MB/sec in 8 byte blocks. This is a > slight overstatement because cache effectiveness is increased by repeatedly > encrypting the same stream. > > If a chat server with a P3-733 has a throughput of, say, 8MB/sec out and > 3MB/sec in, encryption on all that traffic would eat less than 15% of the > CPU. There would be some memory usage to store all the encryption/decryption > state information but memory is cheap. Our tests with RC4 seem to indicate different. Maybe we just have a bad implementation of it. Maybe it's time to look at it more. > If you used a dual processor machine and separated the actual chat layer > from the I/O layer, you could put the encryption in the I/O layer. This is > actually not that terribly hard to hack into Ircd. Nope, and that seperation is planned, but probably not until we do out full rewrite. > I think you're simply assuming that it's infeasible but you haven't > actually tried it or done the math. We've done it with ConferenceRoom, and > the encryption load is so low as to be almost lost in the noise. As I said, we can encrypt now between servers (The code is in). Based on the math we saw testing this functionality, it didn't seem feasible to do it to the clients, but as I said, maybe we just had a bad implementaion. :puts it on the list of things to try: Jason
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