| What: /proc/fs/nfsd/reply_cache_stats |
| Date: March 2013 |
| KernelVersion: 3.10 |
| Contact: linux-nfs@vger.kernel.org |
| Description: |
| Provides statistics for the NFS server duplicate reply |
| cache (DRC). The file contains one labeled field per |
| line. Each line has the form "field name:" followed by |
| whitespace and a decimal value. |
| |
| Fields: |
| |
| ======================= ====== ========================== |
| max entries u32 Upper bound on cache size |
| num entries u32 Current entry count |
| hash buckets u32 Number of hash buckets |
| mem usage s64 Bytes consumed by the DRC |
| cache hits s64 Requests answered from cache |
| cache misses s64 Requests not found in cache |
| not cached s64 Idempotent requests that |
| bypass the cache |
| payload misses s64 XID matched but request |
| checksum did not |
| longest chain len u32 Longest hash chain observed |
| cachesize at longest u32 Cache size when longest |
| chain was recorded |
| ======================= ====== ========================== |
| |
| Counter fields (cache hits, cache misses, not cached, |
| payload misses, mem usage) are maintained with per-cpu |
| counters and may briefly show stale values under |
| concurrent load. There is no way to reset these |
| counters; consumers should compute rates by sampling |
| over time. |
| |
| New fields may be appended in future kernels. Parsers |
| should match on field name, not line position. |
| Users: nfs-utils (https://git.linux-nfs.org/?p=steved/nfs-utils.git) |
