From: Chuck Lever <chuck.lever@xxxxxxxxxx> On Thu, 24 Jul 2025 15:30:49 -0400, Mike Snitzer wrote: > Some workloads benefit from NFSD avoiding the page cache, particularly > those with a working set that is significantly larger than available > system memory. This patchset introduces _optional_ support to > configure the use of O_DIRECT or DONTCACHE for NFSD's READ and WRITE > support. The NFSD default to use page cache is left unchanged. > > The performance win associated with using NFSD DIRECT was previously > summarized here: > https://lore.kernel.org/linux-nfs/aEslwqa9iMeZjjlV@xxxxxxxxxx/ > This picture offers a nice summary of performance gains: > https://original.art/NFSD_direct_vs_buffered_IO.jpg > > [...] Applied to nfsd-testing, thanks! [01/13] NFSD: filecache: add STATX_DIOALIGN and STATX_DIO_READ_ALIGN support commit: af157e09634a113da83d8ac5fff541f9e06ad653 [02/13] NFSD: pass nfsd_file to nfsd_iter_read() commit: 63a534c8b18642dc27318e08b77952c4d7f55628 [03/13] NFSD: add io_cache_read controls to debugfs interface commit: f76b72e4908c556021d94bdeca86fffce430c791 [04/13] NFSD: add io_cache_write controls to debugfs interface commit: a45da44bb6bade1dfef569c792ae2ee6507f4724 [05/13] NFSD: filecache: only get DIO alignment attrs if NFSD_IO_DIRECT enabled commit: af157e09634a113da83d8ac5fff541f9e06ad653 [06/13] NFSD: issue READs using O_DIRECT even if IO is misaligned commit: 6d80efb3cb6f9817bedfa460e9ddf56a916caf2f -- Chuck Lever
