Re: Network very very slow... was iSCSI and jumbo frames

[RVP <rvp%SDF.ORG@localhost>]

On Fri, 5 Feb 2021, Michael van Elst wrote:

> vm.bufcache is 15 (percent) by default. On your 16GB machine 
> that means that I/O of up to about 2GB may look fine, but
> if you move more, things will crawl.

That's intriguingly like what we are seeing here, isn't it?: "small"
I/O transfers of 1GB easily exceed 100MBPS; but 10 GB ones get
capped at 10MBPS.

On Fri, 5 Feb 2021, BERTRAND Joël wrote:

> 	To be sure that this issue does come from qNAP NAS, I have tried to
> replace this initiator by another one (a Linux iscsi initiator)

You installed the `netbsd-iscsi-initiator' package?

> and result is very similar. That's being said, qNAP runs with a Linux kernel...

Any antivirus stuff running on the NAS or on legendre which would
process 1GB files quickly, but would struggle on large 10 GB ones?

And any other filesystem monitoring programs running which would
wake up and start ingesting newly-created files for some reason?
Indexers, cataloguers...

Any special processing on the NAS which says: if data is from
legendre's IP, run the data through some program X?

-RVP