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

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

RVP a écrit :
> 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?

	Nope. There is a /usr/sbin/iscsi-initiator provided by NetBSD itself.

>> 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?

	I don't have any antivirus.

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

	No.

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

	No... There is no special processing.

	JKB