linux-kernel - Re: [patch] Revert "block: remove artifical max_hw

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Date:	Tue, 21 Jul 2015 06:02:46 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	dmilburn@...hat.com
Subject: Re: [patch] Revert "block: remove artifical max_hw_sectors cap"

On Mon, Jul 20, 2015 at 03:17:07PM -0400, Jeff Moyer wrote:
> For SAN storage, we've seen initial write and re-write performance drop
> 25-50% across all I/O sizes.  On locally attached storage, we've seen
> regressions of 40% for all I/O types, but only for I/O sizes larger than
> 1MB.

Workload, and hardare please.  An only mainline numbers, not some old
hacked vendor kernel, please.

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