On Tue, 2009-07-14 at 16:53 +1000, Anton Blanchard wrote: > plain text document attachment (preload_0x10000000) > TASK_UNMAPPED_BASE is not used with the new top down mmap layout. We can > reuse this preload slot by loading in the segment at 0x10000000, where almost > all PowerPC binaries are linked at. > > On a microbenchmark that bounces a token between two 64bit processes over > pipes > and calls gettimeofday each iteration (to access the VDSO), both the 32bit and > 64bit context switch rate improves (tested on a 4GHz POWER6): > > 32bit: 273k/sec -> 283k/sec > 64bit: 277k/sec -> 284k/sec
Any chance you can put that little test program online somewhere ? Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
