Linux 6.16 NFS Client Exposes LOCALIO State Via sysfs
([Linux Storage] 6 Hours Ago
Linux 6.16 NFS)
- Reference: 0001551495
- News link: https://www.phoronix.com/news/Linux-6.16-NFS-Client
- Source link:
In addition to the NFS server changes for Linux 6.16 with now [1]supporting larger I/O block sizes , the Network File-System (NFS) client changes were merged this week for this next kernel version.
NFS client changes for Linux 6.16 include introducing support for fallocate FALLOC_FL_ZERO_RANGE with NFS v4.2+.
"This implements a suggestion from Trond that we can mimic FALLOC_FL_ZERO_RANGE by sending a compound that first does a DEALLOCATE to punch a hole in a file, and then an ALLOCATE to fill the hole with zeroes. There might technically be a race here, but once the DEALLOCATE finishes any reads from the region would return zeroes anyway, so I don't expect it to cause problems."
The NFS client pull also introduces a sequence number cache per RFC2203.
Another feature is now exposing the LOCALIO state via sysfs. Linux NFS servers and clients since the Linux 6.12 kernel support LOCALIO. To know if a client and server negotiated LOCALIO use, it's now indicated via the "localio" attribute in sysfs. LOCALIO can deliver a [2]"extreme" performance boost .
Plus there are various NFS client bug fixes and other enhancements. More details via [3]this pull request .
[1] https://www.phoronix.com/news/Linux-6.16-NFSD
[2] https://www.phoronix.com/news/Linux-6.12-NFS
[3] https://lore.kernel.org/linux-nfs/174899283224.1701538.18147684793517797739.pr-tracker-bot@kernel.org/T/#t
NFS client changes for Linux 6.16 include introducing support for fallocate FALLOC_FL_ZERO_RANGE with NFS v4.2+.
"This implements a suggestion from Trond that we can mimic FALLOC_FL_ZERO_RANGE by sending a compound that first does a DEALLOCATE to punch a hole in a file, and then an ALLOCATE to fill the hole with zeroes. There might technically be a race here, but once the DEALLOCATE finishes any reads from the region would return zeroes anyway, so I don't expect it to cause problems."
The NFS client pull also introduces a sequence number cache per RFC2203.
Another feature is now exposing the LOCALIO state via sysfs. Linux NFS servers and clients since the Linux 6.12 kernel support LOCALIO. To know if a client and server negotiated LOCALIO use, it's now indicated via the "localio" attribute in sysfs. LOCALIO can deliver a [2]"extreme" performance boost .
Plus there are various NFS client bug fixes and other enhancements. More details via [3]this pull request .
[1] https://www.phoronix.com/news/Linux-6.16-NFSD
[2] https://www.phoronix.com/news/Linux-6.12-NFS
[3] https://lore.kernel.org/linux-nfs/174899283224.1701538.18147684793517797739.pr-tracker-bot@kernel.org/T/#t
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