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SUNRPC: add sending,pending queue and max slot to xprt stats

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With static RPC slots, the xprt backlog queue stats were useful in showing
when the transport (TCP) was starved by lack of RPC slots. The new dynamic
RPC slot code, commit d9ba131d8f, always
provides an RPC slot and so only uses the xprt backlog queue when the
tcp_max_slot_table_entries value has been hit or when an allocation error
occurs. All requests are now placed on the xprt sending or pending queue which
need to be monitored for debugging.

The max_slot stat shows the maximum number of dynamic RPC slots reached which is
useful when debugging performance issues.

Add the new fields at the end of the mountstats xprt stanza so that mountstats
outputs the previous correct values and ignores the new fields. Bump
NFS_IOSTATS_VERS.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2012-02-14 16:19:18 -05:00 • committed by Trond Myklebust
parent 1d96e80faf
commit 15a4520621
4 changed files with 29 additions and 10 deletions
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2
include/linux/nfs_iostat.h
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@ -21,7 +21,7 @@
#ifndef _LINUX_NFS_IOSTAT
#define _LINUX_NFS_IOSTAT
#define NFS_IOSTAT_VERS "1.0"
#define NFS_IOSTAT_VERS "1.1"
/*
* NFS byte counters