RHEL for Real Time 8 is designed for well-tuned systems and for applications with extremely high determinism requirements. Kernel system tuning offers the vast majority of the improvement in determinism. Before you begin, perform general system tuning of the standard RHEL 8 system before using RHEL for Real Time 8.
PATCHED cpuiddle extreme
For deployments where RTSJ is not in use, there is a wide range of scheduling priorities below 90 that can be used by applications. Use extreme caution when scheduling any application thread above priority 49 because it can prevent essential system services from running, because it can prevent essential system services from running. This can result in unpredictable behavior, including blocked network traffic, blocked virtual memory paging, and data corruption due to blocked filesystem journaling.
Reasons like that can be (assuming your machine's a notebook) that the battery is removed (or near death) so you are on AC-power only. In this case, a weak AC-source might not supply enough electricity to fulfill extreme peak demands by the overall system and as there is no battery to assist this could lead to data loss, data corruption or in worst case even hardware damage!
Parameters denoted with BOOT are actually interpreted by the bootloader, and have no meaning to the kernel directly.Do not modify the syntax of boot loader parameters without extremeneed or coordination with .
I think the dts file for the 3915 is a little different.I found two relevant dts files in openwrt that might be of interest. There are more, but from older devices.target/linux/mpc85xx/files/arch/powerpc/boot/dts/ws-ap3825i.dtstarget/linux/ath79/dts/qca9557_extreme-networks_ws-ap3805i.dts
If Xen was compiled with INDIRECT_THUNK support, bti-thunk= can be used to select which of the thunks gets patched into the __x86_indirect_thunk_%reg locations. The default thunk is retpoline (generally preferred), with the alternatives being jmp (a jmp *%reg gadget, minimal overhead), and lfence (an lfence; jmp *%reg gadget).
Running tests.......vma05 1 TINFO: timeout per run is 0h 5m 0svma05 1 TFAIL: [vdso] bug not patchedvma05 2 TINFO: AppArmor enabled, this may affect test resultsvma05 2 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)vma05 2 TINFO: loaded AppArmor profiles: none--------------------------------------------------------------------Looking at the contents of the triggered backtrace, on 5.19.0-26 the contents look like this:
Thread 1 (LWP 1501):#0 0x00007f9b3c09226b in ?? ()Backtrace stopped: Cannot access memory at address 0x7ffc216242b0vma05 1 TFAIL: [vdso] bug not patchedvma05 2 TINFO: AppArmor enabled, this may affect test resultsvma05 2 TINFO: it can be disabled with TST_DISABLE_APPARMOR=1 (requires super/root)vma05 2 TINFO: loaded AppArmor profiles: none
Note the problem has not occurred for six days, likely due to some change I made during my \"force the problem on demand\" experiments. Am making some final changes to my monitoring code (which now includes BMC data, Linux cpufreq data and lots MSRs data) and plan to reboot so that the problem can reoccur again. Hopefully I capture enough data during the next event to narrow things down or at least have detailed baseline data for more extreme changes (such as reducing DRAM to lower its power as you suggest).
From what I can tell, the same motherboard is also available with the D1541. I have previously reviewed the bug (errata) documentation, but don't recall any issues specific to one or the other. With a plug-in CPU and discrete PCH, there are lots of combinations. With Xeon D15xx, it is extremely difficult to mismatch anything.
Although we did not test the HD7950 in the Intel i7 extreme/X79 platform, for GPU-limited and GPU computing tasks the Sapphire HD7950 delivered excellent performance for its price point compared to the price/performance compared to the more expensive HD7970 flagship card.
If you cannot afford that setup, the delta between Intel and AMD for software that is GPU limited is not significant enough to justify the 10x price increase. Cheaper Intel systems such as the i7-3820 or 2600K/3770K will be choices that are more reasonable than the 3960X which is intended for extreme end of the market.
Dell R730, dual Intel Xeon E5-2680 v4 CPUs @ 2.40 GHz, 14 cores (28 total), 28 hyperthreads (56 total), 256 GB 2400 MHz RAM, XenServer 7.6 fully patched as of this writing, NVIDIA M60 GPU running GRID 7.1 drivers. Do I wish I had higher intrinsic clock speeds at the expense of fewer cores? Yes, but this is what I had to work with.
The power consumption seems to scale pretty linearly with luminance when using the device's brightness settings. However what is extremely interesting is how power scales with APL (Average Picture Level) and grey-scale level. Theoretically, an OLED's screen power should scale with APL and grey-scale level identically as a 70% grey-scale image is the same APL as an artificial 70% APL image. Here in our measurements we use APL samples consisting of pure white areas and pure black areas to achieve a target APL over the whole screen area.
What remains to be answered is why we see a large difference in power when looking at the grey-scale power figures at equal APL as the APL pattern images. Although the primary brightness is controlled by PWM, the actual color output of each OLED is controlled via voltage. In my research in the past I've actually managed to retrieve the display driver IC's programmed voltage to see how the sub-pixels, and thus color, is actually controlled. Although I haven't looked into the Note 4's driver yet (it's an extremely time-consuming procedure), I had saved up the table of my old Galaxy S4:
I am holding off trying to do any comparisons with LCD screens and past AMOLED generations as I still lack enough data points to make any educated statement on the power efficiency of the different technologies and panel generations. What can be said for certain is that the increasingly higher APL values, and especially white interfaces of Android, are AMOLED's Achilles' Heel. There's no doubt that we could see some very large power efficiency gains if UX design would try to minimize on colors nearing 100% saturation, which leaves some justification for the \"grayscale mode\" when using extreme power saving modes. 076b4e4f54