On Tue, 21 Aug 2007, Mathieu Desnoyers wrote: > * cmpxchg_local Slub test > kmalloc(8) = 83 cycles kfree = 363 cycles > kmalloc(16) = 85 cycles kfree = 372 cycles > kmalloc(32) = 92 cycles kfree = 377 cycles > kmalloc(64) = 115 cycles kfree = 397 cycles > kmalloc(128) = 179 cycles kfree = 438 cycles So for consecutive allocs of small slabs up to 128 bytes this effectively doubles the speed of kmalloc. > kmalloc(256) = 314 cycles kfree = 564 cycles > kmalloc(512) = 398 cycles kfree = 615 cycles > kmalloc(1024) = 573 cycles kfree = 745 cycles Less of a benefit. > kmalloc(2048) = 629 cycles kfree = 816 cycles Allmost as before. > kmalloc(4096) = 473 cycles kfree = 548 cycles > kmalloc(8192) = 659 cycles kfree = 745 cycles > kmalloc(16384) = 724 cycles kfree = 843 cycles Page allocator pass through measurements. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
- References:
- [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Mathieu Desnoyers <[email protected]>
- Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Christoph Lameter <[email protected]>
- Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Mathieu Desnoyers <[email protected]>
- Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Christoph Lameter <[email protected]>
- Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Mathieu Desnoyers <[email protected]>
- Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Christoph Lameter <[email protected]>
- Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Mathieu Desnoyers <[email protected]>
- Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
- From: Christoph Lameter <[email protected]>
- [PATCH] SLUB use cmpxchg_local
- From: Mathieu Desnoyers <[email protected]>
- Re: [PATCH] SLUB use cmpxchg_local
- From: Mathieu Desnoyers <[email protected]>
- Re: [PATCH] SLUB use cmpxchg_local
- From: Mathieu Desnoyers <[email protected]>
- [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486
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