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 303045712 by tinfoil3d on Friday 10th of April 2020 08:12:57 AM
Old 04-10-2020
Hey stomp,
both sides show valid full 10gig, full duplex, I checked that first thing. As stated, txq and mtu match. Raising them to 10000 and 9000 respectively increased speed from 393 to 415 but not any further.
Swapped ports, tried flight-proven cat7 cable: no change.

iperf reports same speed as wget from nginx, apache, even busybox.
The interesting note is when dling to epyc (newer) box it shows 421mbyte/s, downloading to i7 from epyc it shows 415mbyte/s max. I don't know if that may suggest you anything.

also, updating post with more details:
ethtool info for interfaces differs slightly but i'm pretty sure it doesn't matter: you can just see the diff.

this is for i7: https : // paste. ubuntu. com/p/JmDQcYWkbs/
this is epyc: https : / / paste ubuntu .com/p/ZThRF6kcqs/
and this is diff(embedded):
Code:
# diff i7 epyc 
1,2c1
< Cannot get device udp-fragmentation-offload settings: Operation not supported
< Features for eth101:
---
> Features for eth1:
8c7
<     tx-checksum-fcoe-crc: off
---
>     tx-checksum-fcoe-crc: on
32c31
< tx-fcoe-segmentation: off
---
> tx-fcoe-segmentation: on

and ethtool -g for both boxes match:
Code:
Ring parameters for eth1:
Pre-set maximums:
RX:        4096
RX Mini:    0
RX Jumbo:    0
TX:        4096
Current hardware settings:
RX:        4096
RX Mini:    0
RX Jumbo:    0
TX:        4096

 

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IXG(4)							   BSD Kernel Interfaces Manual 						    IXG(4)

NAME
ixg -- Intel(R) 10Gb Ethernet driver SYNOPSIS
ixg* at pci? dev ? function ? DESCRIPTION
The ixg driver provides support for PCI 10Gb Ethernet adapters based on the Intel(R) 82598EB and 82599 10 GbE Controllers. The driver sup- ports Jumbo Frames, TCP Segmentation Offload (TSO). For questions related to hardware requirements, refer to the documentation supplied with your Intel 10GbE adapter. All hardware requirements listed apply to use with NetBSD. Support for Jumbo Frames is provided via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit Jumbo Frames. On NetBSD, the maximum MTU size for Jumbo Frames is 9000 bytes. This driver version supports VLANs. For information on enabling VLANs, see ifconfig(8). HARDWARE
The ixg driver supports the following cards: o Intel(R) 10 Gigabit XF SR/AF Dual Port Server Adapter o Intel(R) 10 Gigabit XF SR/LR Server Adapter o Intel(R) 82598EB 10 Gigabit AF Network Connection o Intel(R) 82598EB 10 Gigabit AT CX4 Network Connection DIAGNOSTICS
ixg%d: Unable to allocate bus resource: memory A fatal initialization error has occurred. ixg%d: Unable to allocate bus resource: interrupt A fatal initialization error has occurred. ixg%d: watchdog timeout -- resetting The device has stopped responding to the network, or there is a problem with the network connection (cable). SUPPORT
For general information and support, go to the Intel support website at: http://support.intel.com. SEE ALSO
arp(4), netintro(4), vlan(4), ifconfig(8) HISTORY
The ixg device driver comes from FreeBSD, where it is called ixgbe(4). It first appeared in NetBSD 6.0. AUTHORS
The ixg driver was written by Intel Corporation <freebsdnic@mailbox.intel.com>. It was imported from FreeBSD into NetBSD by David Young <dyoung@NetBSD.org>. BUGS
The hardware supports a maximum MTU of 16114 bytes, but the NetBSD port of the driver supports only 9000 bytes. The hardware supports Message-Signalled Interrupts (MSI and MSI-X) and Receive-Side Scaling (RSS), however, these features are not enabled in the NetBSD driver at this time. BSD
July 25, 2011 BSD

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