From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id C78411007D5 for ; Thu, 8 Dec 2011 09:03:12 +1100 (EST) Message-ID: <1323295383.12793.3.camel@pasglop> Subject: Re: ibm_newemac tx problem with jumbo frame enabled From: Benjamin Herrenschmidt To: Prashant Bhole Date: Thu, 08 Dec 2011 09:03:03 +1100 In-Reply-To: References: <1322198727.32635.25.camel@pasglop> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, 2011-12-07 at 13:35 +0530, Prashant Bhole wrote: > Still couldn't find anything like fifo overflow... > I noticed one more thing, this problem happens only when mtu size on > the initiator (the other end) is set to 4088, regardless of any mtu > size set for EMAC. Did you check all the registers that may carry errors ? Nothing showed up ? Did you check that things like Pause frames were properly negociated on both sides ? Tried playing with the pause and FIFO thresholds ? Other than using the tx timeout to perform resets I don't see a good way to fix that problem. Cheers, Ben.