On Fri, Apr 22, 2016 at 12:33 PM, Ivan Klymenko <fi...@ukr.net> wrote:
> On Thu, 14 Apr 2016 16:42:33 -0600 > Warner Losh <i...@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? > I don't know. I've not investigated this in enough detail to know. One thing you might change is the read bias from 300 to 1, which may be more appropriate for your workload. Warner _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
