In the virtualization scenario, you can use pvipi to optimize the sending of
IPI interrupts and reduce the number of vmexit.
rps_using_pvipi test
Test guest: 32 core, 64G memory, virtio-net 8 queues, rss interrupt is bound
to 24-31 core. Observe the number of vmexit of 31 cores.
1. 1000000pps
100 iperf instances, 10000pps per instance.
disable rps_using_pvipi 68077 vmexit/s
enable rps_using_pvipi 21138 vmexit/s
2. 2000000pps
1000 iperf instances, 2000pps per instance.
disable rps_using_pvipi 40879 vmexit/s
enable rps_using_pvipi 9195 vmexit/s
3. 2000000pps
2000 iperf instances, 1000pps per instance.
disable rps_using_pvipi 24746 vmexit/s
enable rps_using_pvipi 7292 vmexit/s
Enabling rps_using_pvipi can greatly reduce the number of vmexit.
Signed-off-by: yongduan <yongduan@tencent.com>
Without preemption, if syscall excutes too long it will significantly
affect performance of other important processes. So add a shceduling
point when showing root memcg usage.
Signed-off-by: yongduan <yongduan@tencent.com>
Signed-off-by: charliecgxu <charliecgxu@tencent.com>
This commit add cpu.offline to cpu cgroup, echo 1 > cpu.offline would
convert all tasks under this cgroup to offline task. Beside, a new
sysctl sysctl_sched_bt_ignore_cpubind is added, which makes offline
tasks ignoring CPU binding and running on any CPU.
Signed-off-by: Xiaoming Gao <newtongao@tencent.com>
Signed-off-by: Hua Liu <shookliu@tencent.com>
Signed-off-by: Xiaogguang Chen <xiaoggchen@tencent.com>
Signed-off-by: Zhiguang Peng <zgpeng@tencent.com>
Signed-off-by: Bin Fan <tombinfan@tencent.com>
Signed-off-by: He Chen <heddchen@tencent.com>
Also a switch had been added to control whether show the
subtree or not.
Signed-off-by: Chen He <heddchen@tencent.com>
Signed-off-by: Peng Zhiguang <zgpeng@tencent.com>
Signed-off-by: Chen Xiaoguang <xiaoggchen@tencent.com>
Offline tasks (BT tasks) may have some performance impact to online
tasks.
In this commit, we introduce Intel RDT features to limit offline tasks
L3 cache usage to avoid the influence caused by offline tasks.
Signed-off-by: Xiaoguang Chen <xiaoggchen@tencent.com>
Signed-off-by: He Chen <heddchen@tencent.com>
since we disable clocksource switch when tsc not stable, we need a
counter to track tsc unstable did happend.
Signed-off-by: Xiaoming Gao <newtongao@tencent.com>
output more information when clocksource got unstable,
and add kernel.clocksource_switch_unstable_cs to control
whether to switch off unstable clocksource.
Signed-off-by: Xiaoming Gao <newtongao@tencent.com>
use lightweight track method to count free objects in
slub, remove heavy logic in spin_lock_irqsave.
Signed-off-by: Xiaoming Gao <newtongao@tencent.com>
Add the max_map_count isolation switch kernel.isolate_max_map_count;
The isolation of max_map_count is turned on by default. If you want
to turn it off, set kernel.isolate_max_map_count to 0;
Signed-off-by: Zhiguang Peng <zgpeng@tencent.com>
epoll hrtimer patch may increase loop times if timeout set to 1ms.
This patch add new sysctl control the minimal wait time, and default
to 1 jiffies.
Signed-off-by: Samuel Liao <samuelliao@tencent.com>
Signed-off-by: Xiaoming Gao <newtongao@tencent.com>
Signed-off-by: Fuhai Wang <fuhaiwang@tencent.com>
IEG need cpuinfo's processor field to start from 0 in docker, so add sysctl
cpuset_cpuinfo_show_realinfo to switch whether cpuinfo's processor
field start from 0 or not.
Signed-off-by: Xiaoming Gao <newtongao@tencent.com>
Signed-off-by: Zhiguang Peng <zgpeng@tencent.com>
add /proc/sys/vm/vm_pagecache_limit_async interface which
allow page caches reclaimed in kpclimitd, it will not consume
work threads runtime, but oom may be occured. it's closed default.
Signed-off-by: Zhiping Du <zhipingdu@tencent.com>
Signed-off-by: Chunguang Xu <brookxu@tencent.com>
the print_fatal_signals sysctl can only dump fatal signals from receiver's side,
cannot find who and why send these fatal signals, so add a new sysctl
print_fatal_signals_src_dst to switch dump fatal signals from sender side.
Signed-off-by: Xiaoming Gao <newtongao@tencent.com>
create a pid mapping data to parent processes in file /proc/$PID/status
create a proc file (/proc/$PID/hostinfo), mapping pid data to host pid
Signed-off-by: Lorin Liu <lorinliu@tencent.com>
yongduan