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Top Forums UNIX for Beginners Questions & Answers 10gbe ixgbe slow at 420mbyte/s max, p2p lan cat8 1m, tried ethtool and ifconfig options to no avail Post 303045707 by tinfoil3d on Thursday 9th of April 2020 10:52:43 PM
Old 04-09-2020
[SOLVED] 10gbe ixgbe slow at 420mbyte/s max, p2p lan cat8 1m, tried ethtool and ifconfig options

Hey guys, first time dealing with 10gbe.
I have two boxes, one is older with i7 2.8ghz from 2009 generation, pcie 2.0 and I just put the Intel X550T there to make use of absolutely similar but builtin adapter on my newer box with AMD EPYC gen 1.
I'm dling file from tmpfs on either box and never go above 415mbyte/s which is about half of potential bandwidth there, right?
I tried most stuff from kernel . org/doc/ols/2009/ols2009-pages-169-184.pdf with a little improvement from 393mbyte/s to current 415.
that's the result of me setting mtu 9000, txqueuelen 10000.
Also tried this to no improvements over current result: darksideclouds wordpress com/2016/10/10/tuning-10gb-nics-highway-to-hell/
And a few other pages out there on google, most stating same options.
I don't see a 100% load burst on i7 box when I dl file, it's around 10% across the cores. So CPU shouldn't be a bottleneck, cable(it's 1meter cat8, with a nice thick shielding) shouldn't be a bottleneck and ram speed and pcie 2.0 speed shouldn't be.
iperf also reports same speed.
Tried these tests in both directions.
There's gotta be something obvious that I'm missing, right?

Pretty sure it doesn't matter but it's lfs on i7 and debian 10 on epyc, both sharing same sysctl settings and ethtool-controlled options.
lspci -n for it on both computers:
Code:
62:00.0 0200: 8086:1563 (rev 01)

so it's similar device. I bought this particular one for compatibility but didn't expect these issues.

Maybe someone here would suggest something, I'm out of ideas.
TIA
--
solved see my own response

Last edited by tinfoil3d; 04-11-2020 at 08:48 AM.. Reason: solved, it's PCIe lane count, usb3, sata3, 6 disks, one GPU downgraded to x8 and no more space to have x4 on pcie 2.0 mb with max 16 lanes i7 CPU
 

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wml::std::box(3)						     EN Tools							  wml::std::box(3)

NAME
wml::std::box - Easily Create Rectangular Box SYNOPSIS
#use wml::std::box <box [attributes]> ... </box> DESCRIPTION
The "<box>" container tag puts its body into a nice rectangular box which itself is build via a HTML "<table>" construct. ATTRIBUTES
"header" This attribute switches between two totally different box variants. When it is present, a headlined box is created by the use of one single table but with space GIFs. When this attribute is missing a standard box is created by the use of two nested tables but without any space GIFs. "bgcolor" This sets the background color of the box. "fgcolor" This sets the foreground (text) color of the box. "bdcolor" This sets the color for the border of the box. The effect of this attribute is the automatic generation of a nested table construct to achieve the optical effect. "bdspace" This sets the space between the border and the body of the box in pixels. Default is 4 pixel. "bdwidth" This sets the border width in pixels. Default is 1 pixel. "width" This sets the total table width in pixels. Default is no specific width for the standard box and 300 pixels for the headlined box (because the headlined variant needs to know a fixed size to create the GIFs accordingly). "summary" Add a description of this table. This attribute is recommended in HTML 4.0. EXAMPLE
<box bdcolor="#000000" bdwidth=1 bdspace=10 bgcolor="#ffffff" fgcolor="#000000"> Foo Bar Quux </box> <box header="Foo Bar Quux Header" bdcolor="#000000" bdwidth=1 bdspace=10 bgcolor="#ffffff" fgcolor="#000000"> Foo Bar Quux </box> AUTHOR
Ralf S. Engelschall rse@engelschall.com www.engelschall.com REQUIRES
Internal: P1, P2 SEE ALSO
HTML "<table>" tag. EN Tools 2014-04-16 wml::std::box(3)
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