On Saturday 08 April 2006 04:13, Julian Seward wrote: > Using qemu from cvs simulating x86-softmmu (no kqemu) on x86, > booting SuSE 9.1 and getting to the xdm (kdm?) graphical login > screen, requires making about 1088000 translations, and the > translation cache is flushed 17 times. Booting is not too bad, > but once user-mode starts to run the translation cache is pretty > much hammered. > > I made 2 changes: > > * increase CODE_GEN_BUFFER_SIZE from 16*1024*1024 > to 64*1024*1024, > > * observe that CODE_GEN_AVG_BLOCK_SIZE of 128 > for the softmmu case is too low; my measurements put it > at about 247. So I changed it to 256. > > With those changes in place, the same boot-to-kdm process > requires only about 570000 translations to be made, and 2 > cache flushes to happen. Of course the cost is an extra > 48M of memory use.
Did you measure any actual speedup from these changes? In a typical linux boot there's a lot of new code run only once, so I'd expect the tb cache to be hammered fairly heavily. Paul _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
