Hi there, @cyberbob,
I understand this kind of issue is always a frustrating but let’s try to keep a cordial tone and stay constructive; you’ve received multiple recommendations above but we do not know whether you have tested them and what their results were exactly. Please understand that it is difficult for people to help you any further if they can’t get feedback and additional information on things they’re recommended.
With that out of the way, let’s see if we can do something about the new card. An Intel controller usually should be a bit more robust but we’ve seen some issues in the past with other intel controllers still. Either way, let’s start from the beginning.
First, can you describe steps to reproduce your slow speed? Are these disk writes/reads or pure network speeds as reported by iperf for instance?
I personally would also need some details about your screenshot.
I am assuming you are using Rockstor on Leap 15.4, so you could also try installing the latest drivers and firmware for your controller. For instance:
Drivers
# Get drivers from Intel
wget https://downloadmirror.intel.com/781326/SLES_15.4_igb_5.13.20_RPM.zip
# Install unzip and extract the zip file
zypper --non-interactive in --no-recommends unzip
unzip SLES_15.4_igb_5.13.20_RPM.zip
# Install the drivers
zypper in igb-kmp-default-5.13.20_k5.14.21_150400.22-1.sles15.4.x86_64.rpm
The latter will warn you about unsigned drivers, should be fine to “ignore” and install nonetheless. NOTE that Intel has a mention about adding the signing key if you’re using secure boot… I couldn’t test that but here’s the note:
This release includes the Intel public key to allow you to authenticate the signed driver in secure boot mode. To authenticate the signed driver, you must place Intel’s public key in the UEFI Secure Boot key database.
Firmware packages
Searching on this forum will show you that some additional firmware packages may be needed for some Intel network controllers. Have a look, for instance at the following:
There, you will see that @stitch10925 shared their troubleshooting and solution:
zypper in --no-recommends kernel-firmware-intel kernel-firmware-network kernel-firmware-platform
Of course, make also sure that you are all up-to-date on upstream updates:
zypper update --no-recommends
Let us know how that goes.