[OmniOS-discuss] Slow CIFS Writes when using Moca 2.0 Adapter

[Mini Trader]

Perhaps it was too good to be true.

It seems that one of the parameters is being disregarded for CIFS shares.

1. When the system first starts and I download from my CIFS share, the
transfer rates are good, around 95mb/sec.
2. If I restart CIFS the rates are good.
3. If I wait sometime after the restart or the system has been connected
for a few hours and I attempt to download the rates are bad, around
20mb/sec!
4. If I run iperf when CIFS rates are bad, my speed is good, over
900megabit.

What is going on with CIFS that is causing the client to have slow download
speeds?  It's like CIFS is forgetting the buffer values because whenever I
restart it I am back to good downloads on my client for a brief period.

I appreciate any suggestions.

On Fri, Jan 29, 2016 at 3:09 PM, Bob Friesenhahn <
bfriesen at simple.dallas.tx.us> wrote:

> On Fri, 29 Jan 2016, Guenther Alka wrote:
>
> With the default mtu 1500 you can max out 1G networks but on 10G you are
>> limited to about 300-400 MB/s.
>> With mtu 9000 that is supported on all of my switches and computers the
>> SMB2 limit is near the limit of 10G
>>
>
> Since this topic started about Moca 2.0, its worth mentioning that this
> consumer-grade networking technology might not adequately support large
> MTUs.  A particular Moca 2.0 device might support large MTUs, but this is
> likely atypical.
>
> Hardware that I am working with does support a somewhat elevated MTU (e.g.
> 2k) with Moca 2.0 but that is because we wrote code to support it and
> tested it between two units of our hardware.  With limited interoperability
> testing, we have not encountered other Moca 2.0 hardware which supports MTU
> over 1500 bytes.
>
> Bob
> --
> Bob Friesenhahn
> bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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>
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