Mailinglist Archive: opensuse (1256 mails)

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Re: [opensuse] Re: Is 40 dropped packets out of 300,000 high? This is wired cat5 LAN.
On 2017-06-01 18:53, Yamaban wrote:

Hmm, looking at Intels docu for the X99 chipset, it could well be.
The X99 PCH has a dedicated Gbit MAC integrated, and all the USBs
(3.0 and 2.0) are also handled by the PCH.
Also on the PCH are all the Sata, PCIe 2.0, M.2, and the Audio. All
that has to pass through the DMI 2.0 x4 (16 or 20Gbit) connect to the CPU.

The PCIe 3.0 and the RAM are connected directly to the CPU.

It could well be that the PCH has hiccups in the flow-control, and faces
the decission of mishandling the USB3 timing or dropping eth frames. (for overview)

Can the network hardware read/write directly to a RAM block, without
using the main CPU, through that DMI thing?

That is, the network hardware gets a frame, writes it to the memory
block that it was told earlier to use, then ping the CPU to tell it op
completed. Can it do that?

Or does it simply tell the CPU that it got a frame, please pick it up,
word by word?

Cheers / Saludos,

Carlos E. R.
(from 42.2 x86_64 "Malachite" at Telcontar)

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