From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felipe Balbi Subject: Re: am335x: cpsw: interrupt failure Date: Mon, 29 Dec 2014 11:13:55 -0600 Message-ID: <20141229171355.GJ29379@saruman> References: <20141210171724.GI4602@saruman> <20141210210234.GN4602@saruman> <20141212173210.GI7549@saruman> <20141229155029.GA29379@saruman> <20141229165103.GB2411@atomide.com> Reply-To: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="LQAwcd5tHl0Qlnzi" Cc: Felipe Balbi , Yegor Yefremov , netdev , "N, Mugunthan V" , "linux-omap@vger.kernel.org" To: Tony Lindgren Return-path: Content-Disposition: inline In-Reply-To: <20141229165103.GB2411@atomide.com> Sender: linux-omap-owner@vger.kernel.org List-Id: netdev.vger.kernel.org --LQAwcd5tHl0Qlnzi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Dec 29, 2014 at 08:51:04AM -0800, Tony Lindgren wrote: > * Felipe Balbi [141229 07:53]: > > On Mon, Dec 29, 2014 at 10:33:26AM +0100, Yegor Yefremov wrote: > > > On Fri, Dec 12, 2014 at 8:19 PM, Yegor Yefremov > > > wrote: > > > > On Fri, Dec 12, 2014 at 6:32 PM, Felipe Balbi wrote: > > > >> Hi, > > > >> > > > >> On Fri, Dec 12, 2014 at 01:00:51PM +0100, Yegor Yefremov wrote: > > > >>> U-Boot version: 2014.07 > > > >>> Kernel config is omap2plus with enabled USB > > > >>> > > > >>> # cat /proc/version > > > >>> Linux version 3.18.0 (user@user-VirtualBox) (gcc version 4.8.3 > > > >>> 20140320 (prerelease) (Sourcery CodeBench Lite 2014.05-29) ) #6 S= MP > > > >>> Mon Dec 8 22:47:43 CET 2014 > > > >> > > > >> Wasn't GCC 4.8.x total crap for building ARM kernels ? IIRC it was= even > > > >> blacklisted. Can you try with 4.9.x just to make sure ? > > > > > > > > Will do. > > >=20 > > > Adding linux-omap. Beginning of this discussion: > > > http://comments.gmane.org/gmane.linux.network/341427 > > >=20 > > > Quick summary: starting with kernel 3.18 or commit > > > 55601c9f24670ba926ebdd4d712ac3b177232330 am335x (at least BBB and some > > > custom boards) stalls at high network load. Reproducible via nuttcp > > > within some minutes > > >=20 > > > nuttcp -S (on BBB) > > > nuttcp -t -N 4 -T30m 192.168.1.235 (on host) > > >=20 > > > As Felipe Balbi suggested, I tried both 4.8.3 and 4.9.2 toolchains, > > > but both show the same behavior. > > >=20 > > > Linux version 3.18.0 (user@user-VirtualBox) (gcc version 4.8.3 > > > 20140320 (prerelease) (Sourcery CodeBench Lite 2014.05-29) ) #6 SMP > > > Mon Dec 8 22:47:43 CET 2014 > > > Linux version 3.18.1 (user@user-VirtualBox) (gcc version 4.9.2 > > > (Buildroot 2015.02-git-00582-g10b9761) ) #1 SMP Mon Dec 29 09:22:29 > > > CET 2014 > > >=20 > > > Let me know, if you can reproduce this issue. > >=20 > > finally managed to reproduce this, it took quite a bit of effort though. > > I'll see if I can gether more information about the problem. >=20 > Maybe check if the irqnr is 127 (or the last reserved interrupt) > in irq-omap-intc.c. If so, also print out the previous interrupt. > It seems the intc uses the last reserved interrupt to signal a > spurious interrupt for the previous irqnr, so we should probably > add some handling for that. >=20 > If the previous interrupt is a cpsw interrupt, then there's probably > something wrong with cpsw interrupt handling. Either a missing > read-back to flush posted write in the cpsw interrupt handler, > or the EOI registers are written at a wrong time. yeah, I'll go over it, but I first need to reproduce it again. Just rebooted to try again and after half an hour, couldn't reproduce it anymore. Interesting race to end the year :-) cheers --=20 balbi --LQAwcd5tHl0Qlnzi Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUoYvTAAoJEIaOsuA1yqREx1kP/iT4BVpdW2f5xp4HnBFC2mlC XZNCfAoBTXTzY+aKMy9xM+oiNWeUc7UR5/zmNZepFkEQvKIqT5hcVxYH0ThT1/b3 /UrFFRZD45/tWuH7RlgDAO9/mrSkXiHE/CyUKPf6yVNiL4yCzQcbkdWV1r91P+i6 TSIzAr0TWnVx8Bv3895k0/Fu9f93j5WzI9QdvkOXxGBN+KKprsfoS8lg2I7hLoiG v3g6lbYJvSc14nvLgupVeENfR1z3BBKEam4CDNqP3hcGcd6yFGnwZnjM/Qctr/aE 3sHD/RWc+LafDUjU5ET0i9TPwg5d+UV5PS77WwVEvFyjh2y0/mijz32+RE1AkFxg 7qXotgJKbly0h5BggOxpM42HxIrHFsL6CClMIyo+XFKUGm5sv+LRBK/BlSv2ByYg YT7wQQaJaAEpHI7oHk15qWuGXMSy1kkm/Y82flEb2wR7eg6qxEGWuuwcZS491aKu dZoWKkZL9xSdI1UTS4I1SF6Xe1EmQHMbZOAkt0bHJmDHPHl8MMPB9uaDNR2wfqLO hqScp6tsvH5waT4ekmD/WLqzswGNVMM6tJOw8AGf3TTkzALIBYhcxHGwhA1JRDiS nKaVHs95LgQCnD/234ety3cOzcqvV5dhoZ8aDi4RhsCVVrSyGagSZz5RExHa2J/H 2xfw8dtsQjnXL4cAWDOP =uZxW -----END PGP SIGNATURE----- --LQAwcd5tHl0Qlnzi--