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Michael,
Sorry for the delay.
Michael Sparks wrote:
>
> Wensong,
>
> How long are the connection entries held for ? (Column 8 of
> /proc/net/ip_masquerade ?)
>
The default timeout value for TCP session is 15 minutes, TCP session
after receiving FIN is 2 miniutes, and UDP session 5 minutes.
Anyway, you can use "ipchains -M -S tcp tcpfin udp" to set your own
time values.
> The reason I ask is this: If we assume a clunky set of web servers being
> balanced that take 3s to serve an object, then if the connection entries
> are dropped immediately then we can balance about 20 million web requests
> per minute with 128M RAM. If however the connection entries are kept for a
> longer time period this puts a limit on the balancer.
>
Yeah, it is true.
> Eg (assuming column 8 is the thing I'm after!)
>
Actually, the column 8 is the delta value in sequence numbers. The
timeout value is in column 10.
> [zathras@consus /]$ head -n 1000 /proc/net/ip_masquerade |sed
> -e "s/ */ /g"|cut -d" " -f8|sort -nr|tail -n500|head -n1
> 8398
> [zathras@consus /]$
>
> ie Held for about 2.3 hours, which would limit a 128Mb machine to balance
> about 10.4 million requests per day. (Which is definitely on the low side
> knowing our throughput...)
>
Michael, please create an account on your LVS box for me. I will give
you my public key, and you tell me the password. Then, I can ssh your
host and check around there, which might help me tune the code. Don't
worry about the security, I won't break your system. ;-)
Thanks,
Wensong
> Michael.
> --
> National & Local Web Cache Support R: G117
> Manchester Computing T: 0161 275 7195
> University of Manchester F: 0161 275 6040
> Manchester UK M13 9PL M: Michael.Sparks@xxxxxxxxxxxxxxx
>
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