From: Jeff Darcy <jdarcy-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Anand Avati <anand.avati-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "J. Bruce Fields"
<bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>,
Eric Sandeen <sandeen-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Theodore Ts'o" <tytso-3s7WtUTddSA@public.gmane.org>,
Zach Brown <zab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Bernd Schubert
<bernd.schubert-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>,
linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
gluster-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org
Subject: Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies
Date: Thu, 28 Mar 2013 15:43:48 -0400 [thread overview]
Message-ID: <51549D74.1060703@redhat.com> (raw)
In-Reply-To: <CAFboF2w49Lc0vM0SerbJfL9_RuSHgEU+y_Yk7F4pLxeiqu+KRg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On 03/28/2013 02:49 PM, Anand Avati wrote:
> Yes, it should, based on the theory of how ext4 was generating the
> 63bits. But Jeff's test finds that the experiment is not matching the
> theory.
FWIW, I was able to re-run my test in between stuff related to That
Other Problem. What seems to be happening is that we read correctly
until just after d_off 0x4000000000000000, then we suddenly wrap around
- not to the very first d_off we saw, but to a pretty early one (e.g.
0x0041b6340689a32e). This is all on a single brick, BTW, so it's pretty
easy to line up the back-end and front-end d_off values which match
perfectly up to this point.
I haven't had a chance to ponder what this all means and debug it
further. Hopefully I'll be able to do so soon, but I figured I'd
mention it in case something about those numbers rang a bell.
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WARNING: multiple messages have this Message-ID (diff)
From: Jeff Darcy <jdarcy@redhat.com>
To: Anand Avati <anand.avati@gmail.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
Eric Sandeen <sandeen@redhat.com>,
linux-nfs@vger.kernel.org, "Theodore Ts'o" <tytso@mit.edu>,
Zach Brown <zab@redhat.com>,
Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>,
linux-ext4@vger.kernel.org, gluster-devel@nongnu.org
Subject: Re: [Gluster-devel] regressions due to 64-bit ext4 directory cookies
Date: Thu, 28 Mar 2013 15:43:48 -0400 [thread overview]
Message-ID: <51549D74.1060703@redhat.com> (raw)
In-Reply-To: <CAFboF2w49Lc0vM0SerbJfL9_RuSHgEU+y_Yk7F4pLxeiqu+KRg@mail.gmail.com>
On 03/28/2013 02:49 PM, Anand Avati wrote:
> Yes, it should, based on the theory of how ext4 was generating the
> 63bits. But Jeff's test finds that the experiment is not matching the
> theory.
FWIW, I was able to re-run my test in between stuff related to That
Other Problem. What seems to be happening is that we read correctly
until just after d_off 0x4000000000000000, then we suddenly wrap around
- not to the very first d_off we saw, but to a pretty early one (e.g.
0x0041b6340689a32e). This is all on a single brick, BTW, so it's pretty
easy to line up the back-end and front-end d_off values which match
perfectly up to this point.
I haven't had a chance to ponder what this all means and debug it
further. Hopefully I'll be able to do so soon, but I figured I'd
mention it in case something about those numbers rang a bell.
next prev parent reply other threads:[~2013-03-28 19:43 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-12 20:28 regressions due to 64-bit ext4 directory cookies J. Bruce Fields
2013-02-12 20:56 ` Bernd Schubert
2013-02-12 21:00 ` J. Bruce Fields
2013-02-13 8:17 ` Bernd Schubert
2013-02-13 22:18 ` J. Bruce Fields
2013-02-13 13:31 ` [Gluster-devel] " Niels de Vos
2013-02-13 15:40 ` Bernd Schubert
2013-02-14 5:32 ` Dave Chinner
2013-02-13 4:00 ` Theodore Ts'o
2013-02-13 13:31 ` J. Bruce Fields
2013-02-13 15:14 ` Theodore Ts'o
2013-02-13 15:19 ` J. Bruce Fields
2013-02-13 15:36 ` Theodore Ts'o
[not found] ` <20130213153654.GC17431-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2013-02-13 16:20 ` J. Bruce Fields
2013-02-13 16:20 ` J. Bruce Fields
[not found] ` <20130213162059.GL14195-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2013-02-13 16:43 ` Myklebust, Trond
2013-02-13 16:43 ` Myklebust, Trond
2013-02-13 21:33 ` J. Bruce Fields
2013-02-14 3:59 ` Myklebust, Trond
[not found] ` <4FA345DA4F4AE44899BD2B03EEEC2FA91F3D6BAB-UCI0kNdgLrHLJmV3vhxcH3OR4cbS7gtM96Bgd4bDwmQ@public.gmane.org>
2013-02-14 5:45 ` Dave Chinner
2013-02-14 5:45 ` Dave Chinner
2013-02-13 21:21 ` Anand Avati
2013-02-13 21:21 ` Anand Avati
[not found] ` <CAFboF2wXvP+vttiff8iRE9rAgvV8UWGbFprgVp8p7kE43TU=PA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-02-13 22:20 ` [Gluster-devel] " Theodore Ts'o
2013-02-13 22:20 ` Theodore Ts'o
2013-02-13 22:41 ` J. Bruce Fields
[not found] ` <20130213224141.GU14195-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2013-02-13 22:47 ` Theodore Ts'o
2013-02-13 22:47 ` Theodore Ts'o
[not found] ` <20130213224720.GE5938-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2013-02-13 22:57 ` Anand Avati
2013-02-13 22:57 ` Anand Avati
[not found] ` <CAFboF2z1akN_edrY_fT915xfehfHGioA2M=PSHv0Fp3rD-5v5A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-02-13 23:05 ` [Gluster-devel] " J. Bruce Fields
2013-02-13 23:05 ` J. Bruce Fields
[not found] ` <20130213230511.GW14195-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2013-02-13 23:44 ` Theodore Ts'o
2013-02-13 23:44 ` Theodore Ts'o
[not found] ` <20130213234430.GF5938-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2013-02-14 0:05 ` Anand Avati
2013-02-14 0:05 ` Anand Avati
[not found] ` <CAFboF2zS+YAa0uUxMFUAbqgPh3Kb4xZu40WUjLyGn8qPoP+Oyw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-02-14 21:47 ` [Gluster-devel] " J. Bruce Fields
2013-02-14 21:47 ` J. Bruce Fields
2013-03-26 15:23 ` Bernd Schubert
2013-03-26 15:23 ` [Gluster-devel] " Bernd Schubert
[not found] ` <5151BD5F.30607-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>
2013-03-26 15:48 ` Eric Sandeen
2013-03-26 15:48 ` Eric Sandeen
2013-03-28 14:07 ` Theodore Ts'o
2013-03-28 16:26 ` Eric Sandeen
2013-03-28 17:52 ` Zach Brown
[not found] ` <20130328175205.GD16651-fypN+1c5dIyjpB87vu3CluTW4wlIGRCZ@public.gmane.org>
2013-03-28 18:05 ` Anand Avati
2013-03-28 18:05 ` Anand Avati
[not found] ` <CAFboF2ztc06G00z8ga35NrxgnT2YgBiDECgU_9kvVA_Go1_Bww-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-03-28 18:31 ` [Gluster-devel] " J. Bruce Fields
2013-03-28 18:31 ` J. Bruce Fields
[not found] ` <20130328183153.GG7080-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2013-03-28 18:49 ` Anand Avati
2013-03-28 18:49 ` Anand Avati
[not found] ` <CAFboF2w49Lc0vM0SerbJfL9_RuSHgEU+y_Yk7F4pLxeiqu+KRg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-03-28 19:43 ` Jeff Darcy [this message]
2013-03-28 19:43 ` [Gluster-devel] " Jeff Darcy
[not found] ` <51549D74.1060703-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-03-28 22:14 ` Anand Avati
2013-03-28 22:14 ` Anand Avati
[not found] ` <CAFboF2xkvXx9YFYxBXupwg=s=3MaeQYm2KK2m8MFtEBPsxwQ7Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-03-28 22:20 ` Anand Avati
2013-03-28 22:20 ` Anand Avati
2013-02-14 21:46 ` [Gluster-devel] " J. Bruce Fields
2013-02-14 21:46 ` J. Bruce Fields
[not found] ` <20130213222052.GD5938-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2013-02-14 6:10 ` Dave Chinner
2013-02-14 6:10 ` Dave Chinner
2013-02-14 22:01 ` J. Bruce Fields
2013-02-15 2:27 ` Dave Chinner
2013-02-13 6:56 ` Andreas Dilger
2013-02-13 13:40 ` J. Bruce Fields
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