Nick Piggin <[EMAIL PROTECTED]> writes: > Lustre should probably have to be ported over to write_begin/write_end in > order to use it too. With the patches in -mm, if a filesystem is still using > prepare_write/commit_write, the vm reverts to a safe path which avoids > the deadlock (and allows multi-seg io copies), but copies the data twice.
Not quite relevant for the performance problem. The situation is like this: lustre servers <-lustre network protocol-> lustre client <-NFS-> desktop The NFSd problem is on the lustre client that only plays gateway. That is not to say that the lustre servers or desktop loose performance due to fragmenting writes too but it isn't that noticeable there. > OTOH, this is very likely to go upstream, so your filesystem will need to be > ported over sooner or later anyway. Lustre copies the ext3 source from the kernel, patches in some extra features and renames them during build. So one the one hand it always breaks whenever someone meddles with the ext3 code. On the other hand improvement for ext3 get picked up by lustre semi automatically. In this case lustre would get the begin_write() function from ext3 and use it. MfG Goswin - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/