Date: Tue, 6 Jul 2004 15:44:03 -0000 (GMT) From: Nicolas =?iso-8859-1?Q?B=E9rard_Nault?= <nicobn@quebecbsd.org> To: "Joe Schmoe" <non_secure@yahoo.com> Cc: freebsd-hackers@freebsd.org Subject: Re: concurrent scp transfers (and a testing methodology ?) Message-ID: <3112.24.203.207.162.1089128643.squirrel@webmail.north-zone.net>
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I think the "divide by two" methodology would be flawed because packets would circulate on local loopback which is must faster than Ethernet. More transferts would be possible in a long period of time because of that. Joe Schmoe said: > > I have read several documents on the number of > concurrent https sessions a FreeBSD system is capable > of. > > However, I wonder how well this relates to how many > ssh sessions (scp file transfers, specifically) that a > FreeBSD server can handle. Can anyone throw out some > basic numbers for this ? Assuming a 1ghz p3 and 2gigs > of RAM, and assuming that everyone is transferring a > totally different file. (so there is no amount of > cache hits - everything comes straight off the drives) > > I would think the major bottleneck would be disk - you > would start chugging the disks far before you used up > all the CPU on a 1ghz p3 ... but what is the second > bottleneck ? Is it cpu, or is it ram (or mbufs, etc.) > > Would it be a reasonable test to just start up scp > sessions from the machine to itself and then divide > the number of sessions you can acceptably create by > the number 2 ? Or is this somehow a flawed test ? > > Any additional comments (kernel tunes, settings, war > stories) are greatly appreciated. (like, does SMP help > a lot here, or just a little ?) > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > -- Nicolas Bérard Nault (nicobn@quebecbsd.org) http://www.quebecbsd.org http://www.xeatech.net http://staff.xeatech.net/nicobn "Je ne sais pas avec quelles armes se combattra la troisième guerre mondiale mais je peux vous assurer que la quatrième se combattra avec des pierres et des bâtons." -- Albert Einstein. -- Nicolas Bérard Nault (nicobn@quebecbsd.org) http://www.quebecbsd.org http://www.xeatech.net http://staff.xeatech.net/nicobn "Je ne sais pas avec quelles armes se combattra la troisième guerre mondiale mais je peux vous assurer que la quatrième se combattra avec des pierres et des bâtons." -- Albert Einstein.
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