Re: [Fastboot] [RFC] [PATCH 2/2] kdump: cciss driver initialization issue fix

From: Eric W. Biederman
Date: Mon Jun 26 2006 - 13:38:51 EST


Vivek Goyal <vgoyal@xxxxxxxxxx> writes:

> On Mon, Jun 26, 2006 at 10:00:55AM -0600, Eric W. Biederman wrote:

> I think it does hurt.
>
> - I have seen the case of MPT fusion drvier. It takes significantly more
> time to come up if we choose to reset the device during initialization.
> One of the reasons that we wait in a tight loop for the controller to
> come up after a reset message.
>
> - Long back we fixed ips driver and I remember that the maintainer had
> a similar issue with the reset of device. He did not want to reset the
> device in normal boot because otherwise it took significantly longer
> for the driver to initialize.
>
> - Just now Mike also confirmed that resetting the device definitely
> hurts in terms of time.

In the general case resets are trivial operations. In scsi land
things are different. So a solution appropriate to that domain may
be appropriate.

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