Re: [perf-discuss] Re: TLB lifespan across context switches

2006-06-29 Thread Steve Sistare
David, I suspect your doors arrangement is a losing proposition. A doors call is cheap relative to many IPC methods, but expensive relative to the TLB miss you are trying to avoid. A doors call costs a handful of microseconds or more. A TLB miss takes approx 30 cycles for a TSB hit when the TT

[perf-discuss] Re: TLB lifespan across context switches

2006-06-29 Thread David McDaniel
Wow, thanks for the fast feedback, guys. Sorry about the insufficient detail... I've work with Sun stuff for so long I keep forgetting about the AMD stuff. The hardware this stuff runs on is mostly USIII and IIIi, basically Netra/Sunfire 1280 and 440 boxes. The app is currently 32 bits. We're p