Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size

[Qu Wenruo <quwenruo@cn.fujitsu.com>]

David Sterba wrote on 2015/12/30 17:17 +0100:
> On Wed, Dec 30, 2015 at 10:10:44PM +0800, Qu Wenruo wrote:
>> Now I am on the same side of David.
>> Which means a runtime interface to change them. (along with mkfs option)
>>
>> If provide some configurable features, then it should be able to be
>> tuned at both right time and mkfs time.
>> Or, just don't touch it until there is really enough user demand.
>> (In stripe_len case, it's also a possible choice, as configurable stripe
>> length doesn't really affect much except RAID5/6)
>
> I think that we need configurable stripe size regardless. The
> performance drop is measurable if the stripe size used by filesystem
> does not match the hardware.

Right, I just missed the benchmark from Christoph and forgot the case of 
RAID 5/6.

>
>> I totally understand that implement will cost you a lot of more time,
>> not only kernel part but also user-tool part.
>>
>> But this also means more patches.
>> No matter what the motivation for you to contribute to btrfs, more
>> patches (except the more time spent) are always good.
>>
>> More patches, more reputation built in community, and more patches also
>> means better split code structures for easier review.
>
> Let me note that a good reputation is also built from patch reviews
> (hint hint).

I must admit I'm a bad reviewer.
As when I review something, I always has an eager to rewrite part or all 
the patch to follow my idea, even it's just a choice between different 
design.

Thanks,
Qu


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