Re: [RFC][PATCH] libata: enable SATA disk fua detection on default

[Christoph Hellwig]

On Wed, May 09, 2012 at 02:19:56PM +0800, Zheng Liu wrote:
> disable FUA detection for SATA disk.  If FUA feature can be used, we
> could disable io_barrier to improve the performance.  Now one solution

You can't run with -o nobarrier just because the driver/hardware support
FUA.  However the implementation of -o barrier (aka REQ_FUA) is a lot
more efficient if it is implemented.  If your workload has a high
percentage of REQ_FUA requests it might be better to switch the disks to
write through mode entirely.

--
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/