Subject: Re: DEV_B_SIZE
To: None <email@example.com>
From: Julian Elischer <firstname.lastname@example.org>
Date: 01/31/2003 12:40:28
On Fri, 31 Jan 2003 email@example.com wrote:
> In message <Pine.BSF.4.21.0301311144370.45015-100000@InterJet.elischer.org>, Ju
> lian Elischer writes:
> >One thign I thought of is that it is not uncommon to 'dd' an entire
> >filesystem from one partition to another.
> >If we create a filesystem that is 'aligned' and we copy it to be
> >'unalligned', we'd have a sudden performance drop for no immediatly
> >obvious reason. What was one write, would become a 2-sector read,
> >modify and 2-sector write. Especially when copying from one failing
> >drive to another with slightly different characteristics.
> If you run dd without bs=ALOT you deserve bad throughput.
I'm talking about the performance of the filesystem after it's been
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> phk@FreeBSD.ORG | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.