Hi Maxim,
That sounds rather strange, huge differences due to scheduling are very rare. Which micro architecture was this run on? I can try running it on trunk and see what difference it makes with those options.
Cheers, Wilco IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.