From d976d2cc0bee5a7c0a6b5a8df916cb77ec43978b Mon Sep 17 00:00:00 2001 From: nuclearcat Date: Thu, 6 Jul 2023 01:40:16 +0000 Subject: [PATCH] PCIe lanes limit --- PPPOE_management.md | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/PPPOE_management.md b/PPPOE_management.md index 32f076f..f4c268b 100644 --- a/PPPOE_management.md +++ b/PPPOE_management.md @@ -330,7 +330,29 @@ Detected PPPoE server at interface bond0.2529 ``` As you can see there are 3 other PPPoE servers in the network, and they are all detected by pppoe-discovery. They might cause conflicts during PPPoE session establishment, so it is recommended to find and remove them. +## Hardware issues + +### Reduced size PCI slot +``` +[ 5.584995] ixgbe 0000:05:00.0: Multiqueue Enabled: Rx Queue count = 32, Tx Queue count = 32 XDP Queue count = 0 +[ 5.592552] ixgbe 0000:05:00.0: 16.000 Gb/s available PCIe bandwidth, limited by 5.0 GT/s PCIe x4 link at 0000:00:02.0 (capable of 32.000 Gb/s with 5.0 GT/s PCIe x8 link) +[ 5.608961] ixgbe 0000:05:00.0: MAC: 2, PHY: 14, SFP+: 3, PBA No: Unknown +[ 5.617719] ixgbe 0000:05:00.0: xx:xx:xx:xx:xx:xx +[ 5.632680] ixgbe 0000:05:00.0: Intel(R) 10 Gigabit Network Connection +[ 5.792953] ixgbe 0000:05:00.1: Multiqueue Enabled: Rx Queue count = 32, Tx Queue count = 32 XDP Queue count = 0 +[ 5.802226] ixgbe 0000:05:00.1: 16.000 Gb/s available PCIe bandwidth, limited by 5.0 GT/s PCIe x4 link at 0000:00:02.0 (capable of 32.000 Gb/s with 5.0 GT/s PCIe x8 link) +[ 5.821176] ixgbe 0000:05:00.1: MAC: 2, PHY: 14, SFP+: 4, PBA No: Unknown +[ 5.830715] ixgbe 0000:05:00.1: xx:xx:xx:xx:xx:xx +[ 5.841368] ixgbe 0000:05:00.1: Intel(R) 10 Gigabit Network Connection +[ 6.041356] ixgbe 0000:05:00.0: registered PHC device on eth4 +``` +If you see message about "PCIe bandwidth, limited" this means your slot is likely have limited lanes and cannot reach full capacity. In case of X520 cards, this means about 15Gbit total bandwidth limit (in+out). +Try to change slot or make sure riser have support for all PCIe lanes. + + ### References * [TCPDUMP examples ] (https://hackertarget.com/tcpdump-examples/) * [More tcpdump docs] (https://danielmiessler.com/study/tcpdump/) + +