ea3f01f8af
improve the sysbench ramp-up phase and its peak throughput on
a 16way NUMA box, by turning on WAKE_AFFINE:
tip/sched tip/sched+wake-affine
-------------------------------------------------
1: 700 830 +15.65%
2: 1465 1391 -5.28%
4: 3017 3105 +2.81%
8: 5100 6021 +15.30%
16: 10725 10745 +0.19%
32: 10135 10150 +0.16%
64: 9338 9240 -1.06%
128: 8599 8252 -4.21%
256: 8475 8144 -4.07%
-------------------------------------------------
SUM: 57558 57882 +0.56%
this change also improves lat_ctx from 6.69 usecs to 1.11 usec:
$ ./lat_ctx -s 0 2
"size=0k ovr=1.19
2 1.11
$ ./lat_ctx -s 0 2
"size=0k ovr=1.22
2 6.69
in sysbench it's an overall win with some weakness at the lots-of-clients
side. That happens because we now under-balance this workload
a bit. To counter that effect, turn on NEWIDLE:
wake-idle wake-idle+newidle
-------------------------------------------------
1: 830 834 +0.43%
2: 1391 1401 +0.65%
4: 3105 3091 -0.43%
8: 6021 6046 +0.42%
16: 10745 10736 -0.08%
32: 10150 10206 +0.55%
64: 9240 9533 +3.08%
128: 8252 8355 +1.24%
256: 8144 8384 +2.87%
-------------------------------------------------
SUM: 57882 58591 +1.21%
as a bonus this not only improves the many-clients case but
also improves the (more important) rampup phase.
sysbench is a workload that quickly breaks down if the
scheduler over-balances, so since it showed an improvement
under NEWIDLE this change is definitely good.
182 lines
5 KiB
C
182 lines
5 KiB
C
/*
|
|
* include/linux/topology.h
|
|
*
|
|
* Written by: Matthew Dobson, IBM Corporation
|
|
*
|
|
* Copyright (C) 2002, IBM Corp.
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Send feedback to <colpatch@us.ibm.com>
|
|
*/
|
|
#ifndef _LINUX_TOPOLOGY_H
|
|
#define _LINUX_TOPOLOGY_H
|
|
|
|
#include <linux/cpumask.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/mmzone.h>
|
|
#include <linux/smp.h>
|
|
#include <asm/topology.h>
|
|
|
|
#ifndef node_has_online_mem
|
|
#define node_has_online_mem(nid) (1)
|
|
#endif
|
|
|
|
#ifndef nr_cpus_node
|
|
#define nr_cpus_node(node) \
|
|
({ \
|
|
node_to_cpumask_ptr(__tmp__, node); \
|
|
cpus_weight(*__tmp__); \
|
|
})
|
|
#endif
|
|
|
|
#define for_each_node_with_cpus(node) \
|
|
for_each_online_node(node) \
|
|
if (nr_cpus_node(node))
|
|
|
|
void arch_update_cpu_topology(void);
|
|
|
|
/* Conform to ACPI 2.0 SLIT distance definitions */
|
|
#define LOCAL_DISTANCE 10
|
|
#define REMOTE_DISTANCE 20
|
|
#ifndef node_distance
|
|
#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
|
|
#endif
|
|
#ifndef RECLAIM_DISTANCE
|
|
/*
|
|
* If the distance between nodes in a system is larger than RECLAIM_DISTANCE
|
|
* (in whatever arch specific measurement units returned by node_distance())
|
|
* then switch on zone reclaim on boot.
|
|
*/
|
|
#define RECLAIM_DISTANCE 20
|
|
#endif
|
|
#ifndef PENALTY_FOR_NODE_WITH_CPUS
|
|
#define PENALTY_FOR_NODE_WITH_CPUS (1)
|
|
#endif
|
|
|
|
/*
|
|
* Below are the 3 major initializers used in building sched_domains:
|
|
* SD_SIBLING_INIT, for SMT domains
|
|
* SD_CPU_INIT, for SMP domains
|
|
* SD_NODE_INIT, for NUMA domains
|
|
*
|
|
* Any architecture that cares to do any tuning to these values should do so
|
|
* by defining their own arch-specific initializer in include/asm/topology.h.
|
|
* A definition there will automagically override these default initializers
|
|
* and allow arch-specific performance tuning of sched_domains.
|
|
* (Only non-zero and non-null fields need be specified.)
|
|
*/
|
|
|
|
#ifdef CONFIG_SCHED_SMT
|
|
/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
|
|
* so can't we drop this in favor of CONFIG_SCHED_SMT?
|
|
*/
|
|
#define ARCH_HAS_SCHED_WAKE_IDLE
|
|
/* Common values for SMT siblings */
|
|
#ifndef SD_SIBLING_INIT
|
|
#define SD_SIBLING_INIT (struct sched_domain) { \
|
|
.min_interval = 1, \
|
|
.max_interval = 2, \
|
|
.busy_factor = 64, \
|
|
.imbalance_pct = 110, \
|
|
.flags = SD_LOAD_BALANCE \
|
|
| SD_BALANCE_NEWIDLE \
|
|
| SD_BALANCE_FORK \
|
|
| SD_BALANCE_EXEC \
|
|
| SD_WAKE_AFFINE \
|
|
| SD_WAKE_IDLE \
|
|
| SD_SHARE_CPUPOWER, \
|
|
.last_balance = jiffies, \
|
|
.balance_interval = 1, \
|
|
}
|
|
#endif
|
|
#endif /* CONFIG_SCHED_SMT */
|
|
|
|
#ifdef CONFIG_SCHED_MC
|
|
/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
|
|
#ifndef SD_MC_INIT
|
|
#define SD_MC_INIT (struct sched_domain) { \
|
|
.min_interval = 1, \
|
|
.max_interval = 4, \
|
|
.busy_factor = 64, \
|
|
.imbalance_pct = 125, \
|
|
.cache_nice_tries = 1, \
|
|
.busy_idx = 2, \
|
|
.wake_idx = 1, \
|
|
.forkexec_idx = 1, \
|
|
.flags = SD_LOAD_BALANCE \
|
|
| SD_BALANCE_NEWIDLE \
|
|
| SD_BALANCE_FORK \
|
|
| SD_BALANCE_EXEC \
|
|
| SD_WAKE_AFFINE \
|
|
| SD_SHARE_PKG_RESOURCES\
|
|
| BALANCE_FOR_MC_POWER, \
|
|
.last_balance = jiffies, \
|
|
.balance_interval = 1, \
|
|
}
|
|
#endif
|
|
#endif /* CONFIG_SCHED_MC */
|
|
|
|
/* Common values for CPUs */
|
|
#ifndef SD_CPU_INIT
|
|
#define SD_CPU_INIT (struct sched_domain) { \
|
|
.min_interval = 1, \
|
|
.max_interval = 4, \
|
|
.busy_factor = 64, \
|
|
.imbalance_pct = 125, \
|
|
.cache_nice_tries = 1, \
|
|
.busy_idx = 2, \
|
|
.idle_idx = 1, \
|
|
.newidle_idx = 2, \
|
|
.wake_idx = 1, \
|
|
.forkexec_idx = 1, \
|
|
.flags = SD_LOAD_BALANCE \
|
|
| SD_BALANCE_NEWIDLE \
|
|
| SD_BALANCE_FORK \
|
|
| SD_BALANCE_EXEC \
|
|
| SD_WAKE_AFFINE \
|
|
| BALANCE_FOR_PKG_POWER,\
|
|
.last_balance = jiffies, \
|
|
.balance_interval = 1, \
|
|
}
|
|
#endif
|
|
|
|
/* sched_domains SD_ALLNODES_INIT for NUMA machines */
|
|
#define SD_ALLNODES_INIT (struct sched_domain) { \
|
|
.min_interval = 64, \
|
|
.max_interval = 64*num_online_cpus(), \
|
|
.busy_factor = 128, \
|
|
.imbalance_pct = 133, \
|
|
.cache_nice_tries = 1, \
|
|
.busy_idx = 3, \
|
|
.idle_idx = 3, \
|
|
.flags = SD_LOAD_BALANCE \
|
|
| SD_BALANCE_NEWIDLE \
|
|
| SD_WAKE_AFFINE \
|
|
| SD_SERIALIZE, \
|
|
.last_balance = jiffies, \
|
|
.balance_interval = 64, \
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
#ifndef SD_NODE_INIT
|
|
#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
|
|
#endif
|
|
#endif /* CONFIG_NUMA */
|
|
|
|
#endif /* _LINUX_TOPOLOGY_H */
|