linux-ext4 - Slowness on ext4 master branch (Was: The new ext4 git tree re-org)

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Date:	Sat, 14 May 2011 21:49:16 +0300
From:	Amir Goldstein <amir73il@...il.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Slowness on ext4 master branch (Was: The new ext4 git tree re-org)

On Wed, May 11, 2011 at 9:59 PM, Amir Goldstein <amir73il@...il.com> wrote:
> On Tue, May 10, 2011 at 4:56 PM, Theodore Ts'o <tytso@....edu> wrote:
>>
>> I've uploaded an updated dev branch to the ext4 tree.  Compared to the
>> previous version of dev branch, I've removed my modified version of
>> Allison's "NULL pointer when make_indexed_dir returns -ENOSPC" patch,
>> and I've added Amir's alloc_semp removal patches.  I'm still in the
>> process of reviewing those patches; I've included them to make it easier
>> for I and others to test them.
>>
>
> I have a general question regarding testing for next merge window.
> What kernel do you usually use when testing the dev branch?
> I started writing an xfstest to test online resize and filesystem
> filling in parallel, based on test 224 (Delayed allocation at ENOSPC test).
> I started running test 224 on a kernel built from ext4/master
> and it seemed to run too slow. looking at the waiting tasks
> it looked like it could be related to I/O less throttling.
> Since ext4/master is based on 2.6.39-rc3, I figured maybe I am running
> a buggy kernel, so I merged 2.6.39-rc7 to ext4/master to build a new kernel.
>
> Am I going in the right direction at all?
> I have a dedicated server for tests (X64_64 quad core), so it you would
> like me to run some xfstest runs with specific configuration, or certain
> patches applied, please let me know.
>
>

So now that I know I am not hearing voices, I guess test 224 is also too new
to be tested by many people.
The good news is that test 224 runs smoothly on kernel 2.6.39-rc7.
on ext4 master branch is either hung or took too long time for me to wait.
I will try to find the offending commit on Monday.

Amir.
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