From: Christoph Lameter <clameter@xxxxxxx> Date: Wed, 26 Mar 2008 10:56:17 -0700 (PDT) > One should emphasize that this test was a kernel compile which is not > a load that gains much from larger pages. Actually, ever since gcc went to a garbage collecting allocator, I've found it to be a TLB thrasher. It will repeatedly randomly walk over a GC pool of at least 8MB in size, which to fit fully in the TLB with 4K pages reaquires a TLB with 2048 entries assuming gcc touches no other data which is of course a false assumption. For some compiles this GC pool is more than 100MB in size. GCC does not fit into any modern TLB using it's base page size. -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
|