lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Wed, 5 Dec 2007 00:24:54 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Jared Hulbert" <jaredeh@...il.com>
Cc:	"Chris Friesen" <cfriesen@...tel.com>, linux-kernel@...r.kernel.org
Subject: Re: solid state drive access and context switching

On Tue, 4 Dec 2007 16:08:07 -0800
"Jared Hulbert" <jaredeh@...il.com> wrote:

> On Dec 4, 2007 3:24 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > > Right.  The trend is to hide the nastiness of NAND technology changes
> > > behind controllers.  In general I think this is a good thing.
> >
> > You miss the point - any controller you hide it behind almost inevitably
> > adds enough latency you don't want to use it synchronously.
> 
> I think I get it.  We keep saying that it's the latency is too high.
> I agree that most technologies out there have latencies that are too
> high.  Again I ask the question, what latencies do we have to hit
> before the sync options become worth it?

Probably about 1000 clocks but its always going to depend upon the
workload and whether any other work can be done usefully.

Alan
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists