LINUX IOATDMA DRIVER
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NAPI-compliant drivers can often cause packets to be dropped in the network adaptor itself, before the kernel sees them at all.
As always, check your driver documentation for more information. And dmachannels show that.
CONFIG_INTEL_IOATDMA: Intel I/OAT DMA support
Useful kernel and driver performance tweaks for your Linux server View Comments This article is going to address some kernel and driver tweaks that are interesting and useful. Post as a guest Name. Email Required, but never shown.
Useful kernel and driver performance tweaks for your Linux server at time to bleed by Joe Damato
Thanks for sharing, This is really good oneI will keep visiting your blog, You have shared an interesting blog!! If that is the case, see my last blog post for how to enable DCA manually.
Same is for all channels. However ethtool shows traffic and packets received.
I/O Acceleration Technology
This means that during idle periods, fewer timer interrupts will fire, which should lead to power savings, cooler running systems, and fewer useless context switches. The ee driver allows you to pass a command line option InterruptThrottleRate.
The epoll interface is designed to easily scale to large numbers of file descriptors. Ulka Vaze 6 2.
I/O Acceleration Technology – Wikipedia
The tickless kernel feature allows for on-demand timer interrupts. I want to test both ee and ixgbe drivers with crystal ilatdma dma. GreenReaper 1 12 Posted in linuxmonitoringsystems.
A ioatsma place to look for docs is in your kernel source under Documentation, available on the web here: These settings are old and outdated and do not work insmod ee. If your NIC supports this feature, you can enable it with ethtool:.
So why is dma channels not getting used? This is useful because you can pin the interrupt handlers for your NICs to specific CPUs so that when a shared resource is touched a lock in the network stack and ooatdma to a CPU cache, the next time the handler runs, it will be put on the same CPU avoiding costly cache invalidations that can occur if the handler is put on a different CPU.
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For example, to set the packet size to 1, use: How big are the packets you’re sending through? You can view the current setting with:. Written by Joe Damato July 28th, at 3: If you are unsure, check your driver documentation.