From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eunbyung Park Subject: Re: cap and reservation functionality in the credit2 scheduler? Date: Wed, 05 Oct 2011 20:08:28 +0900 Message-ID: <4E8C3AAC.3070206@gmail.com> References: <4E8BE083.3080000@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: George Dunlap Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org 2011-10-05 오후 7:24, George Dunlap 쓴 글: >> > From my humble point of view, probably additional timer may be required >> to implement them because there isn't any periodic timer in the credit2 >> unlike the previous credit scheduler. >> >> what do you think about it? > I'm not opposed in principle, but until I've seen the whole algorithm, > I can't really comment. :-) Do you have an algorithm in mind? Actually, I don't have any idea in mind yet. however, I will try to devise a method to support them and make a patch. So, If you can afford to review, I will appreciate it :) And, I think that there are still some to-do lists for the credit2 and xl tools needs to include credit2 support. In addition, I found that adjusting dom0 weight have failed to work, but except for the dom0, it worked well. I found that this problem had been on xen-devel lists long time ago, but it seems not to be solved yet. I think this may be related with spinlock. When I remove the vcpu_schedule_lock_irq() in csched_dom_cntl(), it worked well. I'm not sure what is the real problem because I didn't completely understand the mechanism about spinlocks in xen scheduler. Any comments? or new thread needed? -- Best Regards, Eunbyung Park