Return-path: Received: from an-out-0708.google.com ([209.85.132.245]:57545 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756384AbYGAJ3R (ORCPT ); Tue, 1 Jul 2008 05:29:17 -0400 Received: by an-out-0708.google.com with SMTP id d40so382092and.103 for ; Tue, 01 Jul 2008 02:29:16 -0700 (PDT) Message-ID: <43e72e890807010229m12b7382ft8675924cac923c7b@mail.gmail.com> (sfid-20080701_112938_014662_BF5C7419) Date: Tue, 1 Jul 2008 02:29:16 -0700 From: "Luis R. Rodriguez" To: "Tomas Winkler" Subject: Re: compat-wireless high packet loss. Cc: "Johannes Berg" , "Guy Cohen" , "David Miller" , "John W. Linville" , "Linux Wireless" , "Emmanuel Grumbach" , "Patrick McHardy" In-Reply-To: <1ba2fa240806300429l679f1568k584143b448455594@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 References: <1ba2fa240806261603g30c3e757y9166c2f9e05f7666@mail.gmail.com> <247d6d340806282323v3192ead8v149359e482375991@mail.gmail.com> <1214824149.5507.36.camel@johannes.berg> <1ba2fa240806300429l679f1568k584143b448455594@mail.gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: On Mon, Jun 30, 2008 at 4:29 AM, Tomas Winkler wrote: > On Mon, Jun 30, 2008 at 2:09 PM, Johannes Berg > wrote: >> On Sun, 2008-06-29 at 09:23 +0300, Guy Cohen wrote: >>> More info on the issue.. The problem is with TX of unrestrained UDP >>> stream, when the traffic generated at the application layer is larger >>> than the link can pass. With kernel 2.6.26-* the traffic is restrained >>> when the TX FIFOs gets full while in 2.6.25.* frames are dropped at >>> some layer. It seems that the drop happens after the IP fragmentation >>> step at the stack. >> >> does compat use multiqueue now? if not, look in the mac80211 fake mq >> code. > > 2.6.25 has a real mq We only use fake mq support for kernels <= 2.6.22 as 2.6.23 added support for MQ. Also if your 2.6.23 doesn't have MQ it will warn you. Luis