From: Doug Maxey <dwm@maxeymade.com>
To: Mark Lord <mlord@pobox.com>
Cc: Doug Maxey <dwm@maxeymade.com>,
Linux IDE Mailing List <linux-ide@vger.kernel.org>
Subject: Re: hdparm write cache settings
Date: Thu, 21 Oct 2004 11:54:52 -0500 [thread overview]
Message-ID: <200410211654.i9LGsqMR008229@falcon30.maxeymade.com> (raw)
In-Reply-To: <41758B73.60506@pobox.com>
On Tue, 19 Oct 2004 17:47:31 EDT, Mark Lord wrote:
>Hi,
>
>Sure, I can update hdparm to first attempt HDIO_SET_WCACHE.
>If that call is nak'd (usually due to lack of kernel support for it),
>then hdparm will use HDIO_DRIVE_CMD as a fallback.
>
>This is a VERY popular setting among end-users of Linux.
>
I agree this is popular, but from my investigation, it does not really work,
i.e., the drive may take the command, but the ide driver never truly
does the work to fully implement the changed setting. Especially when going
from cache disabled to enabled.
A patch has been submitted (but nak'd) to the do the intercept on
HDIO_DRIVE_CMD and a small rework to actually have the setting "stick"
as it were, with the correct barrier changes in the block layer. See subj
"honor disk write cache setting" on ide list.
++doug
prev parent reply other threads:[~2004-10-21 16:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-15 19:48 hdparm write cache settings Doug Maxey
2004-10-19 21:47 ` Mark Lord
2004-10-21 16:54 ` Doug Maxey [this message]
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