On Mon, Aug 16, 2010 at 9:06 PM, Willy Tarreau <[email protected]> wrote: >> We have now turned the option off temporarily to see if that helps; >> it's only been half an hour, but no problems yet, so I'm optimistic. I >> will let you know when we have confirmed that the problem has >> definitely been solved. > > That would be good.
Everything still looks good with the modified setting. We have enabled it permanently now. Googling a bit, I see that a lot of people have turned on net.ipv4.tcp_tw_recycle in conjunction with HAProxy: http://www.google.no/search?sourceid=chrome&ie=UTF-8&q=haproxy+net.ipv4.tcp_tw_recycle In fact, there's even a guy named Willy who talks about enabling it ;-) http://haproxy.1wt.eu/download/1.3/doc/tcp-splicing.txt Might I suggest adding a new section to the HAProxy documentation that deals with the various OS tuning options? That would be a good place to place a note that discourages the use of net.ipv4.tcp_tw_recycle. >> Apparently there's a safer option that serves an almost identical >> purpose, net.ipv4.tcp_tw_reuse. We are going to try enabling that one >> later. > > That's the one I'm using ;-) Excellent.
