Am Sam, den 28.02.2004 schrieb Alex Lyashkov um 09:21: > Some question for you: > what are maximal packet rate in you uml/tap devices ? > what are maximal bandwidth ? what are system/user CPU usage at this time
tun/tap devices have never given me a reason to do special benchmarking as it always worked without problems. 5 minutes ago I downloaded a 30mb file from a real server to a uml server, both machines running somewhere in germany in different data centers (3 hops between them). it took me less than 3 seconds, wget said 9.59M/s. plus the overhead of http, tcp, ip,... - we are very close to the maximum datarate possible with fast ethernet and this over different network segments. I've seen no significant increase of cpu usage. 3 seconds are a little bit short to judge this, but I do not like to pay traffic for some gigabytes to test the performance of a already well-running system. > ? > Using tun/tap devices need minimal a 2-4 context switches between kernel > and user space. It`s very expensive operation in kernel and need many > system time. hmmm... I've no idea if you're right, but if so - it doesn't matter (to me). how many of your customers, wich I believe to be webhosting companies, have an' avarage network usage of more than 10 megaBYTES per second? paying (using an' avarage european traffic price of 1 euro per gigabyte) something like 25,000.- euros a month for network traffic??? has someone experiences with bridged tun/tap-devices on gigabit ethernet interfaces? cheers, thomas nb: I did this "test" with a p3 (uptime 800+ days :o) and a (on year old) p4, the p4 running the umls on cheap hardware, 2,4GHz, ide and a onboard nic. -- Thomas Gelf <[EMAIL PROTECTED]> _______________________________________________ Vserver mailing list [EMAIL PROTECTED] http://list.linux-vserver.org/mailman/listinfo/vserver
