On 03/02/2018 07:00 PM, Dave Hansen wrote: > On 03/02/2018 09:55 AM, Vlastimil Babka wrote: >> It's even stranger to me. Struct page is 64 bytes these days, exactly a >> a cache line. Unless that changed, Intel CPUs prefetched a "buddy" cache >> line (that forms an aligned 128 bytes block with the one we touch). > > I believe that was a behavior that was specific to the Pentium 4 > "Netburst" era. I don't think the 128-byte line behavior exists on > modern Intel cpus. I remember it on Core 2 something (Nehalem IIRC). And this page suggests up to Broadwell, and it can be disabled. And it's an L2 prefetcher indeed. https://software.intel.com/en-us/articles/disclosure-of-hw-prefetcher-control-on-some-intel-processors -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
