On Tue, 2006-10-17 at 14:50 -0500, Debbie Tropiano wrote: > Hello - > > One of my users would like a kernel parameter changed. We're running > CentOS 4.2 so I'm not sure if we need to upgrade the kernel for this > change or not. He's seen that in the 2.6.11.12 kernel "PIPE_SIZE is > defined in include/linux/pipe_fs_i.h and takes on the value of PAGE_SIZE" > He wants PIPE_SIZE to be increased to 8*PAGE_SIZE. > Can this be changed in the 2.6.9 kernel? If so, where would this be changed? > I am not sure if that file is in 2.6.9 or not, but you can install the kernel SRPM and do extract (go to the SPECS dir and do rpmbuild -bp kernel-2.6.spec) you will have a full kernel tree in the BUILD directory. > If not, what kernel would be suggested for an upgrade (we have some experience > with FC3 & the 2.6.11 kernel already)? > > Last, in your opinion does changing the kernel rev greatly change the name > of what you're running? If we go to say the 2.6.16 kernel on our CentOS 4.2 > system, is it still valid to call it CentOS 4.2? If you are using it internally, sure. If you are distributing it ... not really :) Keep in mind that the kernel is not on an island and things like GLIBC are affected by the kernel and it's capabilities. Also, be aware that many things are compiled against the kernel headers some items can cause issues. These are mostly minimal, however it is possible that some programs will not function properly, especially things like selinux and auditing. Also, certain options are required for the extended ext3 functionality, etc. Personally, I think that the RedHat guys are very smart wrt to the kernel and I think the kernel is the most important part of the distro. So, other than building other modules or changing options in the config file (like we do with the centosplus kernel), I would normally use (and recommend) what they produce. That is not to say that other kernels, properly configured, could not perform better ... I would just not do it unless it was absolutely the only option. Thanks, Johnny Hughes
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