From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: hugetlbfs not working Date: Thu, 27 Mar 2008 11:07:02 -0500 Message-ID: <47EBC626.4010801@codemonkey.ws> References: <47EBBB1A.30109@qumranet.com> <80C24060-EF44-44C5-96E2-C629F0A52EBD@csgraf.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel , Avi Kivity To: Alexander Graf Return-path: In-Reply-To: <80C24060-EF44-44C5-96E2-C629F0A52EBD@csgraf.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces@lists.sourceforge.net Errors-To: kvm-devel-bounces@lists.sourceforge.net List-Id: kvm.vger.kernel.org Alexander Graf wrote: > On Mar 27, 2008, at 4:19 PM, Avi Kivity wrote: > > >> Alexander Graf wrote: >> >>> Hi, >>> >>> I'm currently trying to get hugetlbfs working on the current git >>> version and am quite puzzled to see it not working. It appears as >>> if the ftruncate call fails: >>> >>> open("/dev/hugetlbfs//kvm.vI3G8z", O_RDWR|O_CREAT|O_EXCL, 0600) = 7 >>> unlink("/dev/hugetlbfs//kvm.vI3G8z") = 0 >>> ftruncate(7, 157286400) = -1 EINVAL (Invalid >>> argument) >>> dup(2) = 8 >>> fcntl(8, F_GETFL) = 0x8001 (flags O_WRONLY| >>> O_LARGEFILE) >>> close(8) = 0 >>> write(2, "ftruncate: Invalid argument\n", 28ftruncate: Invalid >>> argument >>> ) = 28 >>> close(7) = 0 >>> >>> My host kernel is a 2.6.22. >>> >>> Is this supposed to work? The first version did not have the >>> ftruncate call, so maybe it doesn't work at all with hugetlbfs? >>> >>> >> Are you on i386 non-pae? that has 4MB pages, while you're asking >> for for 37.5 4MB pages. >> >> Try adding 2MB to the requested memory size. >> > > I'm on x86_64 and /proc/meminfo tells me: > > HugePages_Total: 1435 > HugePages_Free: 1435 > HugePages_Rsvd: 0 > Hugepagesize: 2048 kB > > I also reserved all available huge pages: > > % cat /proc/sys/vm/nr_hugepages > 1435 > > Changing the guest memory size using -m does not help. > If you don't bail when ftruncate fails, does it work as expected for you? Perhaps older versions of hugetlbfs didn't support truncate. Regards, Anthony Liguori > Alex > > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > _______________________________________________ > kvm-devel mailing list > kvm-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/kvm-devel > ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace