From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1DzyPP-0002m6-H2 for qemu-devel@nongnu.org; Tue, 02 Aug 2005 11:10:23 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1DzyPN-0002lG-5r for qemu-devel@nongnu.org; Tue, 02 Aug 2005 11:10:22 -0400 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1DzyPK-0002UB-MA for qemu-devel@nongnu.org; Tue, 02 Aug 2005 11:10:18 -0400 Received: from [66.54.152.27] (helo=jive.SoftHome.net) by monty-python.gnu.org with smtp (Exim 4.34) id 1DzyFh-000255-22 for qemu-devel@nongnu.org; Tue, 02 Aug 2005 11:00:21 -0400 From: Mulyadi Santosa Subject: Re: Re: [Qemu-devel] FC2 guest is working slower than RH9 on FC2 host Date: Tue, 2 Aug 2005 21:42:02 +0700 References: <200507311508.50882.a_mulyadi@softhome.net> <41e41e7a05073102174793e98b@mail.gmail.com> <200508021326.27745.a_mulyadi@softhome.net> In-Reply-To: <200508021326.27745.a_mulyadi@softhome.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200508022142.02640.a_mulyadi@softhome.net> Reply-To: a_mulyadi@softhome.net, qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org On Tuesday 02 August 2005 13:26, Mulyadi Santosa wrote: > I have tried it....still feel slower than RH 9....I've tried > HPET=disable too with no luck. I'll try to investigate this issue > deeper but still welcome everyone's ideas Following up my own earlier posting today, I have discovered the reason why FC2 boots and runs so slow. FC2 default kernel is incorporating non standard 4G/4G VM split, enabled by this .config parameter: CONFIG_X86_4G_VM_LAYOUT=y It has been warned already by Linux kernel's help related to the above parameter, that it triggers more TLB flushes and more overhead when doing copy_from/to_user. Qemu-doc.html also warns more or less same thing about FC2 default kernel So far, the best I can tell is, use standard 2.6 kernel on both host and guest to avoid this kind of non standard VM split. clock=pit also helps speeding up execution a bit regards Mulyadi