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Date:   Thu, 14 May 2020 10:29:57 -0600
From:   Andreas Dilger <>
To:     Ritesh Harjani <>
Cc:     Alex Zhuravlev <>,
        "" <>
Subject: Re:  [PATCH 1/2] ext4: mballoc to prefetch groups ahead of scanning

On May 14, 2020, at 03:42, Ritesh Harjani <> wrote:
> Hello Alex,
> Few comments to understand the patch better.
>> On 4/28/20 10:50 AM, Alex Zhuravlev wrote:
>> Together with the patch "ext4: limit scanning of uninitialized groups"
> Where is this patch which says ^^^^^ ?

I think that patch was eventually merged into this one?

>> the mount time of a 1PB filesystem is reduced significantly:
>>               0% full    50%-full unpatched    patched
>>  mount time       33s                9279s       563s
> Looks good. Do you have perf improvement numbers with this patch alone?
> Wonder if this could show improvement if I make my FS image using dm-sparse?

That is hard to say, because the sparse image may not need seeking
when reading the bitmaps. You can test with an artificial delay via DM. 

>> Lustre-bug-id:
> Not sure if this is required.

This should be kept, as it i the same as existing Debian or Bugzilla tags.
It contains a lot more detail on history and earlier versions of the patches. 

Cheers, Andreas

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