Update 23 Dec
Please see my new post here.
Managed to go through 6100rq/s by playing with Keepalive requests between backends. Seems even 1 rq/s more from apache can mean up to 200+rq/s at varnish frontend.

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2012, December the 22, 0h50 a.m..
I’ve done it. One whole night of work, but it’s done. Passed the 150rq/s gap. Then the 300. Then it happened.

Results are here : 2694rq/s on a 1Vcpu/1GBRam VPS for a WordPress3.3 Instance on Index page. 0.003sec Average request time.

I’ll write a real paper on this during the next week. Meanwhile, first handmade schema explains it all. Virtous circle.

Oh, and teaser:
APC Opcode Cache is slower than on-disk static files served by Nginx. More than 3 times slower than on-disk files on a poor 80 I/Ops SATA Hard-drive.