Le vendredi 21 mai 2010 à 02:05 +0200, Andrea Arcangeli a écrit : > If you're running scientific applications, JVM or large gcc builds > (see attached patch for gcc), and you want to run from 2.5% faster for > kernel build (on bare metal), or 8% faster in translate.o of qemu (on > bare metal), 15% faster or more with virt and Intel EPT/ AMD NPT > (depending on the workload), you should apply and run the transparent > hugepage support on your systems. > > Awesome results have already been posted on lkml, if you test and > benchmark it, please provide any positive/negative real-life result on > lkml (or privately to me if you prefer). The more testing the better. > Interesting ! Did you tried to change alloc_large_system_hash() to use hugepages for very large allocations ? We currently use vmalloc() on NUMA machines... Dentry cache hash table entries: 2097152 (order: 12, 16777216 bytes) Inode-cache hash table entries: 1048576 (order: 11, 8388608 bytes) IP route cache hash table entries: 524288 (order: 10, 4194304 bytes) TCP established hash table entries: 524288 (order: 11, 8388608 bytes) 0xffffc90000003000-0xffffc90001004000 16781312 alloc_large_system_hash+0x1d8/0x280 pages=4096 vmalloc vpages N0=2048 N1=2048 0xffffc9000100f000-0xffffc90001810000 8392704 alloc_large_system_hash+0x1d8/0x280 pages=2048 vmalloc vpages N0=1024 N1=1024 0xffffc90005882000-0xffffc90005c83000 4198400 alloc_large_system_hash+0x1d8/0x280 pages=1024 vmalloc vpages N0=512 N1=512 0xffffc90005c84000-0xffffc90006485000 8392704 alloc_large_system_hash+0x1d8/0x280 pages=2048 vmalloc vpages N0=1024 N1=1024 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>