Bart Schaefer wrote: > On 5/30/07, Feizhou <feizhou at graffiti.net> wrote: >> Have you tried the latest mainline kernel on the Centos 5 box? > > What do you mean by "mainline"? www.kernel.org kernel. Latest 2.6.21 has the fix for the faulty kernel GART IOMMU code. > > We have not tried building a kernel, nor installing any drivers or > other kernel-related software other than that available from the > CentOS project repos. However, the machine is fully yum-updated. So you also do not have the IOMMU enabled in your boxes?