Low performance

[Ing. Rainer Pietsch]

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Am 2012-01-09 12:03, schrieb Voelker, Bernhard:
> Tomasz wrote:
>
>> I had network data transfer issue some time ago where transfers in one (A
>> to B) direction were at full network speed.. Transfers in opposite
>> directions (B to A) where going at 1 to 2 Kbit/sec.
>>
>> Eventually the cause was tracked down and it turned out to be a duplex
>> mismatch caused by auto-negotiation protocols between two switches, and
>> also between one of the switches and one of the hosts
>
> I once had experienced a similar bottleneck: it was solaris 10 with
> 10g cards, and turning off auto-negotiation solved the problem.
>
> BTW: you still didn't show us the results with e.g. scp. I assume
> it to be at the same level.
>
> Have a nice day,
> Berny
>
root at Marc:~# dd if=/var/samba/zerotest of=/dev/null bs=1M
10240+0 Datensätze ein
10240+0 Datensätze aus
10737418240 Bytes (11 GB) kopiert, 4,62835 s, 2,3 GB/s

sys     0m0.010s
root at Marc:~# date ; nc 10.99.11.6 1234 </var/samba/zerotest ; date
Mo 9. Jan 17:03:39 CET 2012
Mo 9. Jan 17:04:29 CET 2012


This mean about 220MByte/s disk to disk with the simplest possible
transmission.

I have send the raw transmission-infos with another mail.

- -- 
Mit freundlichen Grüßen / best regards

Ing. Rainer Pietsch
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PCS - Pichler Computer Systeme
Inh. Claudia Pichler-Pietsch
Hauptplatz 10
A-2751 Steinabrückl
Österreich / Austria
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mail:  r.pietsch at pcs-at.com
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