6/26/2023 0 Comments Windows afd buffer default![]() Balancing network interrupts among multiple CPUs increases the performance of network-based operations.įor detailed instructions on how to configure SMP IRQ Affinity, see the following document which is only summarized below: The default network interrupt behavior uses a single processor (typically CPU0) to handle all network interrupts and can become a serious performance bottleneck with high volumes of network traffic. Most Linux installations are not configured to balance network interrupts. Most Linux distributions also support irqbalance, which is aware of the cache topologies and power management features of modern multi-core and multi-socket systems. For Coherence, significant performance can be gained by balancing ethernet card interrupts for all servers that host cluster members. The feature is referred to as SMP IRQ Affinity and results in better system performance as well as better CPU utilization. Linux kernels have the ability to balance hardware interrupt requests across multiple CPUs or CPU cores. If present, work with your system administrator to identify and correct the cause allowing the TSC timesource to be used. Kernel: Falling back to a sane timesource now.Īs the log messages suggest, this can be caused by a variable rate CPU (SpeedStep), having DMA disabled, or incorrect TSC synchronization on multi CPU computers. ![]() Kernel: Incorrect TSC synchronization on an SMP system (see dmesg). Kernel: You don't have DMA enabled for your hard disk (see hdparm), Kernel: TSC cannot be used as a timesource. It is suggested that you check your system logs ( /var/log/dmesg) to verify that the following is not present. Note that Coherence and the underlying JVM are not aware of the timesource which the operating system is using. The slower time sources can be 10 to 30 times more expensive to query then the TSC timesource, and may have a measurable impact on Coherence performance. Linux chooses TSC by default and during startup checks for inconsistencies, if found it switches to a slower safe timesource. ![]() Linux has several high resolution timesources to choose from, the fastest TSC (Time Stamp Counter) unfortunately is not always reliable.
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