The LAPIC advancement improvement is minimal (3 or 4 us) and its
calculation has shown to be problematic under certain
scenarios (for example if qemu-kvm is not installed).
Remove it.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
RHEL will include a backport of the kernel patch
"do not raise timer softirq unconditionally (spinlockless version)"
(https://lkml.org/lkml/2019/4/15/1215), but disabled by default.
Enable it in realtime-virtual-{host/guest} profiles as it decreases
maximum cyclictest latency.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
So that QEMU uses the in kernel irqchip.
Original patch provided by Luiz Capitulino <lcapitulino@redhat.com>.
Resolves: rhbz#1554458
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
Disabling the ksm and ksmtuned services during boot seems to cause
problems, so do it only once when the profile is first applied and
reenable the services only when full rollback is required.
Resolves: rhbz#1622239
Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>
The rt-entsk application, part of newer rt-setup packages,
worksaround a latency issue with static key
IPI's. What it does it:
/*
* Open a socket, and enable timestamping on it.
*
* This is to avoid Chrony from changing timestamping
* user count from 0->1 and vice-versa, causing
* static key enable/disable IPIs.
*
*/
Start/stop the systemctl service from the realtime-virtual-host
and realtime-virtual-guest profiles.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
As noted in the bugzilla ticket
https://bugzilla.redhat.com/show_bug.cgi?id=1554851
The QEMU I/O thread can interrupt the time measurement
of the timer. To avoid this problem, only
pin the vCPU thread.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-and-Tested-by: Luiz Capitulino <lcapitulino@redhat.com>
v2:
- Use unix sockets (Luiz)
- Proper numeric output (Luiz)
In the cpu-partitioning profile, IRQ affinity change is already done
as part of the 'isolated_cores' option of the scheduler plugin, so
calling defirqaffinity is, at best, redundant. So let's remove the call.
In the realtime* profiles, it's essentially the same, except that tuna
was used instead of isolated_cores. So let's use built-in functionality
instead of tuna and drop calls to defirqaffinity.
Resolves: rhbz#1590937
Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>
The code was completely broken. Jaroslav and I think the purpose
of the code was to check that the files
/sys/module/kvm/parameters/kvmclock_periodic_sync
/sys/module/kvm_intel/parameters/ple_gap
contain "0", which we think is the (at least intended) result of
profiles/functions:setup_kvm_mod_low_latency(). So I'm fixing it
to do that.
Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>
script.sh has been using variable names in different ways,
in different scopes: when using variables at all. Fix all that.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Profile loading is broken since commit b532e9291d, due to
a small typo in the new function name.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
KSM is enabled by default when the qemu-kvm-common-rhev package is
installed. We don't want KSM to run in KVM-RT nor cpu-partitioning
hosts, as it can cause spikes or packet drops.
This series disables KSM in those profiles when they are activated.
Likewise, we re-enable KSM when the profile is de-activated in
case it's enabled by default in systemd.
Luiz Capitulino (3):
profiles: functions: add functions to disable/enable KSM
realtime-virtual-host: disable KSM
cpu-partitioning: disable KSM
profiles/cpu-partitioning/script.sh | 2 ++
profiles/functions | 37 ++++++++++++++++++++++++++++++++
profiles/realtime-virtual-host/script.sh | 3 +++
3 files changed, 42 insertions(+)
--
2.9.5
Return-Path: lcapitulino@redhat.com
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From: Luiz Capitulino <lcapitulino@redhat.com>
To: jskarvad@redhat.com
Cc: kvm-rt@redhat.com
Subject: [PATCH 1/3] profiles: functions: add functions to disable/enable KSM
Date: Tue, 3 Oct 2017 15:53:50 -0400
Message-Id: <20171003195352.22910-2-lcapitulino@redhat.com>
In-Reply-To: <20171003195352.22910-1-lcapitulino@redhat.com>
References: <20171003195352.22910-1-lcapitulino@redhat.com>
X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12
They will be used by the next commits.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Tuna is already executed in the realtime profile which is included by
the realtime-virtual-host/guest profiles, there is no need to execute
it twice. Also fixed minor whitespace inconsistency.
Related: rhbz#1472840
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
With systemd full rollback is done if Tuned is terminated by user or profile
is changed. It is not done if Tuned is terminated due to system
shutdown / reboot. Without systemd full rollback is done only if profile
is changed.
Renamed profile_switch parameter to full_rollback where appropriate.
Also fixed various checks for command not found.
Resolves: rhbz#1421286
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
We create the /etc/modprobe.d/kvm.rt.tuned.conf file at
every boot. However, there's nothing that guarantees that
the kvm module will be loaded after tuned. Indeed, it's
possible to reproduce a race where the kvm module is loaded
before tuned. When this happens, the kvm module will be
loaded with incorrect parameters as the kvm.rt.tuned.conf
file doesn't exist.
The solution to this problem is to create the kvm.rt.tuned.conf
file only if it doesn't exist and delete it when changing
profiles.
Resolves: rhbz#1292117
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
profiles/realtime-virtual-host/script.sh | 26 +++++++++++++++++---------
1 file changed, 17 insertions(+), 9 deletions(-)
Profiles shipped in tuned-profiles-nfv subpackage. The content was provided
by Jeremy Eder <jeder@redhat.com> and Clark Williams <williams@redhat.com>.
Resolves: rhbz#1228803
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
