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From: Christoph Hellwig <hch@infradead.org>
To: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	Jens Axboe <axboe@kernel.dk>,
	linux-kernel@vger.kernel.org, dmilburn@redhat.com
Subject: Re: [patch] Revert "block: remove artifical max_hw_sectors cap"
Date: Tue, 21 Jul 2015 06:02:46 -0700	[thread overview]
Message-ID: <20150721130246.GA28676@infradead.org> (raw)
In-Reply-To: <x49bnf6y443.fsf@segfault.boston.devel.redhat.com>

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.


  parent reply	other threads:[~2015-07-21 13:02 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-20 19:17 Jeff Moyer
2015-07-20 20:24 ` Jens Axboe
2015-07-20 20:44   ` Jeff Moyer
2015-07-21 13:02 ` Christoph Hellwig [this message]
2015-07-29 16:52   ` Jeff Moyer
2015-07-30  0:25     ` Elliott, Robert (Server Storage)
2015-07-30 14:03       ` Jeff Moyer
2015-07-30 13:51     ` Christoph Hellwig
2015-07-30 14:08       ` Jeff Moyer
2015-08-10 17:23       ` Jeff Moyer
2015-08-11 14:28         ` Christoph Hellwig
2015-07-20 19:17 Jeff Moyer

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