The receiver is zos.  Anybody here know how to increase the buffers in zos. 

Ron

Sent from my iPhone

On Jul 25, 2013, at 1:14 PM, "Ursula Braun" <ubr...@linux.vnet.ibm.com> wrote:

> Ron,
> 
> Carsten's first explanation is correct. If you see tx_errors on a
> HiperSockets interface, it usually means transmission of a packet fails
> because the receiver has currently no free receive buffer. You should
> verify first if the receiver has configured the maximum of 128 buffers
> (sysfs attribute buffer_count) for his HiperSockets device. 128 is
> nowadays the default, but older qeth driver versions run with a default
> of 16. If you see the tx_errors even though your receiver runs already
> with the maximum of 128 buffers, you either have to live with the
> autotuning mechanisms of tcp or you take actions to slow down the sender
> or to accelerate the receiver.
> 
> As Alan suggested we can document this in the Device Driver book. The
> other option would be to change the current behavior of the qeth driver
> and increase probably both the tx_dropped and the tx_error counter.
> 
> It is definitely not a problem to report to SuSe folks.
> 
> Kind regards, Ursula Braun, Linux on System z development, IBM Germany
> 
> On Thu, 2013-07-25 at 13:18 +0000, Ron Foster wrote:
>> Carsten,
>> 
>> Do you know where I would start looking for causes of the transmit errors on 
>> Hipersockets?
>> 
>> The error is occurring on SLES11 SP2 systems.  We are not having it on our 
>> SLES10 SP4 systems.
>> 
>> Do I need to open a problem with the SuSe folks?
>> 
>> Thanks,
>> 
>> Ron Foster
>> 
>> Baldor Electric Company
>> 
>> 5711 R S Boreham Jr Street
>> 
>> Fort Smith, AR 72901
>> 
>> Phone:479-648-5865
>> 
>> Fax:479-646-5440
>> 
>> Email: ron.fos...@baldor.abb.com
>> 
>> IM Address:rfos...@baldor.com
>> 
>> www.baldor.com
>> 
>> 
>> 
>> ________________________________________
>> From: Linux on 390 Port [LINUX-390@VM.MARIST.EDU] on behalf of Carsten Otte 
>> [co...@de.ibm.com]
>> Sent: Thursday, July 25, 2013 7:53 AM
>> To: LINUX-390@VM.MARIST.EDU
>> Subject: Re: TX-Errs on hipersocket interface.
>> 
>> Alan wrote:
>>> Carsten, this is information that really needs to be in the Device Driver
>>> book, as it differs from the traditional interpretation of TX/RX counters.
>> Ah, you're right - that would be accouned as dropped, not TX error. Forget
>> about my
>> reply then, time to look at other causes for that TX error. Sorry for the
>> noise.
>> 
>> with kind regards
>> Carsten Otte
>> System z firmware development / Boeblingen lab
>> ---
>> Every revolution was first a thought in one man's mind;
>> and when the same thought occurs to another man, it is the key to that era.
>> 
>> - Ralph Waldo Emerson, Essays: First Series, 1841
>> 
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