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Date: Fri, 22 Apr 2016 21:33:32 +0300
From: Ivan Klymenko <fidaj@ukr.net>
To: Warner Losh <imp@bsdimp.com>
Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: Heads up
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On Thu, 14 Apr 2016 16:42:33 -0600
Warner Losh <imp@bsdimp.com> wrote:

> The CAM I/O scheduler has been committed to current. This work is
> described in
> https://people.freebsd.org/~imp/bsdcan2015/iosched-v3.pdf though the
> default scheduler doesn't change the default (old) behavior.
> 
> One possible issue, however, is that it also enables NCQ Trims on ada
> SSDs. There are a few rogue drives that claim support for this
> feature, but actually implement data corrupt instead of queued trims.
> The list of known rogues is believed to be complete, but some caution
> is in order.
> 
> Warner

Hi.

I have the small issue.
I have one hard drive with zfs.
If i beginning cloning the hard drive in VirtualBox machine - this
process is very slow 1,5-2 hours.
Without CAM_NETFLIX_IOSCHED options - this process two or three times
faster.
With this is possible to do something?
Thanks.