44 lines
2.2 KiB
Plaintext
44 lines
2.2 KiB
Plaintext
Looking at the specfile, here's what realtime-setup gets you:
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1. Create a realtime group:
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/usr/sbin/groupadd -f -g 71 realtime
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2. Turns on "panic on hung task":
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sysctl -w kernel.hung_task_panic=0 >/dev/null 2>&1
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3. Sets "hung task" threshold to 600 seconds:
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sysctl -w kernel.hung_task_timeout_secs=600
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4. Installs and enables systemd realtime-setup service file:
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install -m 644 -D realtime-setup.service /usr/lib/systemd/system/realtime-setup.service
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systemctl enable realtime-setup
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5. installs realtime rules in /etc/security/limits.d/realtime.conf:
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@realtime soft cpu unlimited
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@realtime - rtprio 99
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@realtime - nice -20
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@realtime - memlock unlimited
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6. install udev rules in /etc/udev/rules.d/99-rhel-rt.rules
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# udev rules specific to RHEL-RT Realtime kernel
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# insure /dev/rtc points to /dev/rtc0
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# we use PROGRAM rather than SYMLINK because there is
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# a (good) possibility that a /dev/rtc device file
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# already exists and we want to replace it (hence the
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# ln -sf)
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KERNEL=="rtc0", PROGRAM+="/bin/ln -sf rtc0 /dev/rtc"
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# Give permission to the realtime group to write a zero to /dev/cpu_dma_latency
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# This will tell the power management system not to transition to a high cstate
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KERNEL=="cpu_dma_latency", GROUP="realtime"
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# Give permission to the realtime group to read the per cpu msr and cpuid
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# registers. This is needed by cyclictest in rt-tests when using the new
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# feature to read the smi counters. This is necessary but not sufficient
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# A program that wants to access these registers will also need CAP_SYS_RAWIO
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SUBSYSTEM=="msr", GROUP="realtime", MODE="0640"
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SUBSYSTEM=="cpuid", GROUP="realtime", MODE="0640"
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7. install sysconfig rules for RT in /etc/sysconfig/realtime-setup
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#
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# Decide whether to turn off SLUB cpu_partial support
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#
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SLUB_CPU_PARTIAL="off"
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8. install script to turn off SLUB cpu-partial support:
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/usr/bin/slub_cpu_partial_off
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9. install kernel-is-rt script in /usr/sbin/kernel-is-rt
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10. install a C binary that enables socket timestamping:
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install -m 755 -D -s realtime-entsk /usr/sbin/realtime-entsk
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