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Forum Discussion
jumbo frames slow things down
Hi,
I have a pc with NIC capable of doing Jumbo Frames (9K). It´s connected to a netgear GS108. The label of the GS108 says GS108GE and has serialnumb 21620C3H0025A.
On the netgear site it says this switch is supporting JF since serial numb starting 1DR or 127x5B or 127x5C.
My ReadyNas Ultra 2 is also connected to the GS108 and when not using Jumbo Frames a large .iso file coppies to the NAS with approx 55MB/sec.
When I turn on Jumbo Frames on both the PC and the NAS performance drops below 10MB/sec.
Which seems a bit odd ? Is there something wrong with the GS108 ?
Frank
I have a pc with NIC capable of doing Jumbo Frames (9K). It´s connected to a netgear GS108. The label of the GS108 says GS108GE and has serialnumb 21620C3H0025A.
On the netgear site it says this switch is supporting JF since serial numb starting 1DR or 127x5B or 127x5C.
My ReadyNas Ultra 2 is also connected to the GS108 and when not using Jumbo Frames a large .iso file coppies to the NAS with approx 55MB/sec.
When I turn on Jumbo Frames on both the PC and the NAS performance drops below 10MB/sec.
Which seems a bit odd ? Is there something wrong with the GS108 ?
Frank
12 Replies
Replies have been turned off for this discussion
- If you were only getting 1.5 MB w/o JF then there was something very wrong. 60 MB also seems out-of-line for a v1. Were you testing with a small file? Caching can sometimes make the speed measurements incorrect.
JF can help, but not always. The reason it can help is that JF reduces CPU/interrupt load on the end devices. Whether that matters or not depends on the NIC card features in the end device and the speed of the device. Also, most home routers don't support JF at all - usually you'll need a switch. - my mistake, yes, rather 15MB MAX w/o JF ;)
But...., as I was writing my previous coment, I changed something in my config and....... now I am stuck again at 15MB/s MAX
>>> Noooooooooooo :/
my config:
NV+: JF: on, MTU: 7936
Switch: Maximum Frame Size 7936
my PC (realtek Gig-E): JF on and max MTU : 7K (aslo tried 9K, no change).
between them: CAT3 cable (+/- cat6E / cat7, with a dedicated sat wire).
my transfers :
I send three files to my readynas simultaeously: 2,5MB by transfer....
simultaeously, I send another file to another NAS: 25MB (throughput has not changed for that NAS).
>> the problem should thus come from my readynas but I cannot understand/find the problem. this nas is really pissing me off........
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