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 Message-ID: <20160422213332.7e031073@nonamehost.local> In-Reply-To: <CANCZdfpnYnVrvhNagYUT9RhAuC1AMCrxh=GCt8RKT0bqxuJybw@mail.gmail.com> References: <CANCZdfpnYnVrvhNagYUT9RhAuC1AMCrxh=GCt8RKT0bqxuJybw@mail.gmail.com>
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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.
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