From: Joe Thornber <thornber@redhat.com>
To: Jagan Reddy <gjmsreddy@yahoo.com>,
device-mapper development <dm-devel@redhat.com>
Subject: Re: dm-thin vs lvm performance
Date: Fri, 20 Jan 2012 17:33:34 +0000 [thread overview]
Message-ID: <20120120173333.GA12920@ubuntu> (raw)
In-Reply-To: <20120120170335.GA10518@ubuntu>
On Fri, Jan 20, 2012 at 05:03:35PM +0000, Joe Thornber wrote:
> For me, the first run of aio_stress manages a throughput of ~9G/s.
> After the wipe, which is just a simple dd across the device,
> performance drops to ~5.5 G/s. Also throughput on the device under
> the linear target also drops. Permanently.
>
> I don't know if this is specific to aio, or a more general slowdown.
It's just me being stupid. For the initial pass the ramdisk has no
memory backing it and is just returning zeroes.
Back to testing ...
- Joe
next prev parent reply other threads:[~2012-01-20 17:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-13 0:55 dm-thin vs lvm performance Jagan Reddy
2012-01-16 12:42 ` Joe Thornber
2012-01-18 19:30 ` Jagan Reddy
2012-01-20 17:03 ` Joe Thornber
2012-01-20 17:33 ` Joe Thornber [this message]
2012-01-20 18:07 ` Joe Thornber
2012-01-20 21:06 ` Jagan Reddy
2012-01-22 20:24 ` Joe Thornber
2012-01-24 23:58 ` Jagan Reddy
2012-01-27 14:58 ` Joe Thornber
2012-01-28 18:54 ` Jagan Reddy
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