Asrock C2750 CIFS under performing?

Hardware Hub Networking
1

Hello TS forums. This is my first post, but I’ve been a longish time subscriber to the RazeTheW0rld channel.

I recently decided to build a new NAS to replace my Phenom II/6TB FreeNAS system. After doing some research I went with the Asrock C2750 board for: the low power usage, high core-count processor, performance (I’ll get into my issues in a bit), memory capacity (I’m using 32GB of ECC RAM), and size (ITX).

I’m using the C2750 board in this case, with a Noctua 140mm fan at the back.
32GB of Crucial ECC RAM.
And five 4TB HGST drives in RAIDZ1.

In @wendell 's review he said he could saturate gigabit using this board for a FreeNAS system using SMB.

And in this video someone using encrypted volumes got over 80MB/s consistently.

Meanwhile, I’ve only managed mid-70’s with some low 80’s if I’m lucky.

I’ve set up a RAIZD1 array and used the FreeNAS “autotune” utility after seeing this unimpressive performance and nothing changed.

dd read/write results.

2

what nic in your desktop? what switch? (tried a crossover cable?)

4

The NIC on the desktop is an Intel NIC the board is the Evga X99
Micro. I've configured an MTU of 9014 on both the NAS boxes and my
desktop. My previous NAS can max out gigabit on reads and writes.

The switch is an off brand gigabit switch, but I can max out gigabit on the other NAS so I think it is unlikely to be the issue

5

try a default mtu? I had to fiddle with it for large mtus and performance was better at small mtus for "only" gigabit speeds

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6

Wow. Leaving the options/mtu empty got 103MB/s. Thanks Wendell!

Interesting quirk. I'm sad a server-grade board can't do high mtus.

7

It can but requires tweaking :) its the receive window scaling stuff you need to tweak

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8

BTW use iperf to get that going with large mtus its installed on freenas then explore smb tweaks

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