> I do have one question though (but only indirectly about this case)... > > When systems are under high load... > - will dtrace buffers be expanded to meet demand? > - will performance be slowed to ensure there is no loss with respect to > dtrace probes? > - is there any scope for being able to communicate that dtrace has missed a > packet (or two), should that happen if all of the buffers are full? (This is > only important for TCP)
Hey Darren, These are obviously outside of the scope of this case. These questions are answered in the DTrace documentation and in the original DTrace PSARC material (2001/466). Briefly, DTrace buffers are not expanded on demand (indeed, that's architecturally impossible), no throttling takes place, and DTrace has mechanisms for expressing the fact that trace data has been dropped (a necessary consequence of the scope of DTrace). Adam -- Adam Leventhal, Fishworks http://blogs.sun.com/ahl _______________________________________________ opensolaris-arc mailing list [email protected]
