Hey guys,I'm very disappointed... I was expecting a passionated exchange on the necessity of this parameter in that environment, something like a thread of 40/50 emails that would have led to a doc somewhere on the internet
But... nothing. Maybe you guys are discussing in private and are going to reveal your secrets as an oreilly book in a week or two ? no ?
OK, seriously, I know willy studied a lot linux optimisation, and apparently there are a bunch of people here who know a lot on the subject... what do you think about sharing that with the padawans ? :)
(stepping back and watching) Julien Ashwani Wason a écrit :
Willy, In one of the relatively recent posts you mentioned, "The rest is "just" kernel parameter tuning. I'm thinking about writing a tuning guide for 2.6 kernels. I've once again been contacted by a big site this week-end which was dying under load because the sysctls had not been tuned, and that's a shame :-/". I am wondering if you ever managed to create that guide. I am planning to evaluate HAProxy and compare its performance with one of my own TCP proxy on Linux. So far for a target benchmark and a prototype (simple data copy from clients to the servers and back) I have been able to achieve ~800 mbps (reported by application, not including TCP/IP/link headers) with a single process (no threads) instance on 2.6.18 on a 2.6GHz CPU (machine with four CPUs) and two e1000g NICs (one for client and one for server). I have done the usual stuff that I required to get this to work (bind the interrupts from NICs to two CPUs, bind the process to the third CPU, do TCP tuning like syn backlog, tw reuse/recycle/buckets, tcp wmem/rmem, driver tuning such as rx rings, etc.) The link is gbps so obviously my expectation is to get as close to gbps as possible. Routing tests have shown that I should be able to do ~970mbps. However, with two processes I am unable to reach that limit. Without going into much details as to what exactly is happening (which I don't mind going into if useful), I was looking for information on how you are tuning for gigabit links. Thanks, - Ashwani
-- julien http://jve.linuxwall.info/blog
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