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

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Message-ID: <20151230161722.GF4227@twin.jikos.cz>
Date:	Wed, 30 Dec 2015 17:17:22 +0100
From:	David Sterba <dsterba@...e.cz>
To:	Qu Wenruo <quwenruo.btrfs@....com>
Cc:	Sanidhya Solanki <jpage.lkml@...il.com>,
	David Sterba <dsterba@...e.cz>, calestyo@...entia.net,
	clm@...com, jbacik@...com, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size

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.

> 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).
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