On 03/24/2015 01:49 PM, Christoph Hellwig wrote: > On Tue, Mar 24, 2015 at 08:43:31AM -0400, Anna Schumaker wrote: >>> I don't know, and don't have profiles. I'll either try to reproduce or >>> wait till Anna's back from vacation. >> >> I'm using whatever functions NFSD already uses for reading files, >> which I expect go through the VFS. Is there a flag that controls >> cache behavior? > > There's the O_DIRECT flag, but that's not what I mean. If you just > wrote to it it's a cached read, if you did unmount the filesystem after > writing, or did an echo to /proc/sys/vm/drop_caches you get uncached > read behavior. Oh, I'm doing uncached reads for my tests. I'm collecting updated numbers now! Anna > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
