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bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?
From: |
Eric Blake |
Subject: |
bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine? |
Date: |
Fri, 12 Oct 2012 09:35:20 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 |
On 10/12/2012 09:25 AM, Linda Walsh wrote:
[please don't top-post on technical lists]
>
> Hey guys, this is still a bug though:
>
> Ishtar:dev/shm# dd if=4G of=4Ga bs=4G count=1
> 0+1 records in
> 0+1 records out
> 2147479552 bytes (2.1 GB) copied, 4.0274 s, 533 MB/s
> (note no error message....)
Nope, that's not a bug, but behavior required by POSIX. You asked dd to
read _up to 4G_ for a count of exactly 1. Just because the read was
short does not make it an error.
--
Eric Blake address@hidden +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Linda Walsh, 2012/10/11
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Paul Eggert, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Linda Walsh, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Paul Eggert, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Pádraig Brady, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Paul Eggert, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Pádraig Brady, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Linda Walsh, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Linda Walsh, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?,
Eric Blake <=
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Linda Walsh, 2012/10/12
- bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Eric Blake, 2012/10/12
bug#12626: Bug?: dd limited to <2G read size (2G-8K) on 64 bit machine?, Linda Walsh, 2012/10/12