Messages in this thread | | | Date | Mon, 07 Mar 2005 15:35:36 +0100 | From | Christian Schmid <> | Subject | Re: BUG: Slowdown on 3000 socket-machines tracked down |
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Ben Greear wrote: >> Its a full-duplex. Its a download-service with 3000 downloaders all >> over the world. > > > So actually it's really mostly one-way traffic, ie in the download > direction. > Anything significant at all going upstream, other than ACKs, etc?
Not much. See on the graph. The red is the downstream ;)
>> Yes. send-buffer to 64 kbytes and receive buffer to 16 kbytes. > > > With regard to this note in the 'man 7 socket' man page: > > NOTES > Linux assumes that half of the send/receive buffer is used for > internal kernel struc- > tures; thus the sysctls are twice what can be observed on the wire. > > What value are you using for the sockopt call?
First I used 64 * 1024 but some months ago I checked with getsockopt and realized that it always gives twice of the value back. So I just have done 64 * 512 ;)
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