[QUESTION] Jumbo frames in ATIH 2016 WinPE or Linux
ATIH 2016
I have experimented with Jumbo frames (9000 bytes) I've enabled it on my new Cicso L2 switch aswell on the L3 Switch in the other room where my "NAS" (Windows 10 PC with SMB shares) is located.
In theory I should have only to enable Jumbo frames for each participient in the network card drivers and aswell on the Cisco devices (port based).
Pratically - because one of the switches did not behave as intended - it was rough way to get there so at the end I cannot recommend it, nor do I see significant improvements over normal frame sizes (1500bytes)
One question I still have in general is:
Is it, or why it is not, possible to setup specific network settings in the ATIH Linux recovery, for example to enable Jumbo frame and desired frame size?


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Thanks Enchantech, good to know that the kernel supports it but in Windows I can only setup this in the driver.
"If jumbo frames are enabled on the NIC"
While the question is where to set it up in the Linux ATIH 2016. Do yo have an answer about this? Is there a command line command I have to setup for the Linux based recovery?
Infact I can say that I see that the frames on Windows (monitored with Wireshark) are being sent correctly now but I don't see much of a performance gain. On the other hand I have a very good performance 60-115 Mbyte per second depending file sizes and file types.
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I am not a Linux expert by any means however, I use an NAS I built myself running FreeNAS which is FreeBSD based (Linux). In my case just having the Jumbo Frames enabled on the NIC on both the machine running TI and the NAS works. When I use the boot recovery media I do not notice any degradation of performance although I have never measured or checked to see if there is a difference. If there is it is not noticeable so it never pushed me to investigate.
60 to 115MBps is very respectable. I do not know what NAS device you use nor how that device is setup (raid, JBOD) but disk performance does play a key role in results. In my situation the FreeNAS OS allows for the use of the ZFS file system which was originally developed by Sun Micro Systems. This was an open source project so development has continued under the OpenZFS Project for Linux. Essentially this file system allows for the pooling of installed drives to create a single volume. My machine has 4-3TB WD Red NAS drives installed. In my setup the connection between my Windows machines and the NAS is done over CIFS/SMB. If I transfer a large number of compressed video files in MP4 containers using Windows my transfer speeds run 100MBps plus and I routinely see spikes of up to 190Mbps and sometimes even higher. I recently ran a full system disk backup and watched network performance using Windows Task Manager performance feature. Transfer were in the high 600Mbps to mid 700Mbps range meaning a network utilization of about 4/5ths of the total Gigabit network bandwidth. I don't think you can do any better than that.
I do know that Jumbo Frames do not work for some systems. In my case they do and I know this because prior to my setting up Jumbo Frame use my transfer speeds would never get above about 80MBps so in my case I saw a huge increase in performance.
Just a suggestion is that you might try a complete shutdown of your network, all devices, and restart everything and see if things improve. I do this at times when things seem to be a bit off which is very rarely and it seems to make a difference. Not sure exactly why but seems to work.
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Thanks for help Enchantech!
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