From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: can hypervisor run on multi-core at the same time Date: Sun, 19 Oct 2008 10:12:51 +0100 Message-ID: References: <200810191624398285727@gmail.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1146911471==" Return-path: In-Reply-To: <200810191624398285727@gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xdongp , xen-devel List-Id: xen-devel@lists.xenproject.org > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --===============1146911471== Content-type: multipart/alternative; boundary="B_3307255973_11196347" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3307255973_11196347 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable How are you measuring performance? The hypervisor can run simultaneously on every core of a multi-core system. It does have internal locking and synchronisation of course, but actually there=B9s little contention when different VMs run on different cores. -- Keir On 19/10/08 09:24, "xdongp" wrote: > Hi, > I found that there is a sharp decline on VM's performance when a numb= er of > VM runing on the same physical hostile, I think maybe xen hypervisor is > bottleneck, my question is can hypervisor run on multi-core at the same t= ime. > thanks! > =20 > 2008-10-19=20 >=20 > xdongp=20 >=20 >=20 > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel --B_3307255973_11196347 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Re: [Xen-devel] can hypervisor run on multi-core at the same time</T= ITLE> </HEAD> <BODY> <FONT FACE=3D"Verdana, Helvetica, Arial"><SPAN STYLE=3D'font-size:12.0px'>How a= re you measuring performance? The hypervisor can run simultaneously on every= core of a multi-core system. It does have internal locking and synchronisat= ion of course, but actually there’s little contention when different V= Ms run on different cores.<BR> <BR>  -- Keir<BR> <BR> On 19/10/08 09:24, "xdongp" <xdongp@gmail.com> wrote:<BR> <BR> </SPAN></FONT><BLOCKQUOTE><FONT FACE=3D"Verdana, Helvetica, Arial"><SPAN STYL= E=3D'font-size:12.0px'>Hi,<BR>     I found that there is a sharp decline on VM's perfo= rmance when a number of VM runing on the same physical hostile, I think mayb= e xen hypervisor is bottleneck, my question is can hypervisor run on multi-c= ore at the same time. thanks!<BR>  <BR> <FONT COLOR=3D"#C0C0C0">2008-10-19 <BR> </FONT><HR ALIGN=3DLEFT SIZE=3D"2" WIDTH=3D"100%"><FONT COLOR=3D"#C0C0C0">xdongp <B= R> </FONT><BR> <HR ALIGN=3DCENTER SIZE=3D"3" WIDTH=3D"95%"></SPAN></FONT><FONT SIZE=3D"2"><FONT FA= CE=3D"Monaco, Courier New"><SPAN STYLE=3D'font-size:10.0px'>____________________= ___________________________<BR> Xen-devel mailing list<BR> Xen-devel@lists.xensource.com<BR> <a href=3D"http://lists.xensource.com/xen-devel">http://lists.xensource.com/x= en-devel</a><BR> </SPAN></FONT></FONT></BLOCKQUOTE><FONT SIZE=3D"2"><FONT FACE=3D"Monaco, Courie= r New"><SPAN STYLE=3D'font-size:10.0px'><BR> </SPAN></FONT></FONT> </BODY> </HTML> --B_3307255973_11196347-- --===============1146911471== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel --===============1146911471==-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: "xdongp" <xdongp@gmail.com> Subject: can hypervisor run on multi-core at the same time Date: Sun, 19 Oct 2008 16:24:42 +0800 Message-ID: <200810191624398285727@gmail.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1196373635==" Return-path: <xen-devel-bounces@lists.xensource.com> List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> List-Post: <mailto:xen-devel@lists.xensource.com> List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help> List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel <xen-devel@lists.xensource.com> List-Id: xen-devel@lists.xenproject.org This is a multi-part message in MIME format. --===============1196373635== Content-Type: multipart/alternative; boundary="=====003_Dragon131442273050_=====" This is a multi-part message in MIME format. --=====003_Dragon131442273050_===== Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: 7bit Hi, I found that there is a sharp decline on VM's performance when a number of VM runing on the same physical hostile, I think maybe xen hypervisor is bottleneck, my question is can hypervisor run on multi-core at the same time. thanks! 2008-10-19 xdongp --=====003_Dragon131442273050_===== Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: 7bit <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=gb2312"> <META content="MSHTML 6.00.2900.2873" name=GENERATOR><LINK href="BLOCKQUOTE{margin-Top: 0px; margin-Bottom: 0px; margin-Left: 2em}" rel=stylesheet></HEAD> <BODY style="FONT-SIZE: 10pt; MARGIN: 10px; FONT-FAMILY: verdana"> <DIV><FONT face=Verdana size=2>Hi,</FONT></DIV> <DIV>    I found that there is a sharp decline on VM's performance when a number of VM runing on the same physical hostile, I think maybe xen hypervisor is bottleneck, my question is can hypervisor run on multi-core at the same time. thanks!</DIV> <DIV><FONT face=Verdana size=2></FONT> </DIV> <DIV align=left><FONT face=Verdana color=#c0c0c0 size=2>2008-10-19 </FONT></DIV><FONT face=Verdana size=2> <HR style="WIDTH: 122px; HEIGHT: 2px" align=left SIZE=2> <DIV><FONT face=Verdana color=#c0c0c0 size=2><SPAN>xdongp</SPAN> </FONT></DIV></FONT></BODY></HTML> --=====003_Dragon131442273050_=====-- --===============1196373635== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel --===============1196373635==--