10f8f58d4a
Instead of taking 8 specific bytes of file handle to identify file during RPC thread affitinity handling, use trivial hash of the full file handle. ZFS's struct zfid_short does not have padding field after the length field, as result, originally picked 8 bytes are loosing lower 16 bits of object ID, causing many false matches and unneeded requests affinity to same thread. This fix substantially improves NFS server latency and scalability in SPEC NFS benchmark by more flexible use of multiple NFS threads. Sponsored by: iXsystems, Inc.
113 lines
3.9 KiB
C
113 lines
3.9 KiB
C
/*-
|
|
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
/* $FreeBSD$ */
|
|
|
|
#ifndef _NFS_FHA_H
|
|
#define _NFS_FHA_H 1
|
|
|
|
#ifdef _KERNEL
|
|
|
|
/* Sysctl defaults. */
|
|
#define FHA_DEF_ENABLE 1
|
|
#define FHA_DEF_BIN_SHIFT 22 /* 4MB */
|
|
#define FHA_DEF_MAX_NFSDS_PER_FH 8
|
|
#define FHA_DEF_MAX_REQS_PER_NFSD 0 /* Unlimited */
|
|
|
|
/* This is the global structure that represents the state of the fha system. */
|
|
struct fha_global {
|
|
struct fha_hash_entry_list *hashtable;
|
|
u_long hashmask;
|
|
};
|
|
|
|
struct fha_ctls {
|
|
int enable;
|
|
uint32_t bin_shift;
|
|
uint32_t max_nfsds_per_fh;
|
|
uint32_t max_reqs_per_nfsd;
|
|
};
|
|
|
|
/*
|
|
* These are the entries in the filehandle hash. They talk about a specific
|
|
* file, requests against which are being handled by one or more nfsds. We
|
|
* keep a chain of nfsds against the file. We only have more than one if reads
|
|
* are ongoing, and then only if the reads affect disparate regions of the
|
|
* file.
|
|
*
|
|
* In general, we want to assign a new request to an existing nfsd if it is
|
|
* going to contend with work happening already on that nfsd, or if the
|
|
* operation is a read and the nfsd is already handling a proximate read. We
|
|
* do this to avoid jumping around in the read stream unnecessarily, and to
|
|
* avoid contention between threads over single files.
|
|
*/
|
|
struct fha_hash_entry {
|
|
LIST_ENTRY(fha_hash_entry) link;
|
|
u_int64_t fh;
|
|
u_int32_t num_rw;
|
|
u_int32_t num_exclusive;
|
|
u_int8_t num_threads;
|
|
struct svcthread_list threads;
|
|
};
|
|
|
|
LIST_HEAD(fha_hash_entry_list, fha_hash_entry);
|
|
|
|
/* A structure used for passing around data internally. */
|
|
struct fha_info {
|
|
u_int64_t fh;
|
|
off_t offset;
|
|
int locktype;
|
|
};
|
|
|
|
struct fha_callbacks {
|
|
rpcproc_t (*get_procnum)(rpcproc_t procnum);
|
|
int (*realign)(struct mbuf **mb, int malloc_flags);
|
|
int (*get_fh)(uint64_t *fh, int v3, struct mbuf **md, caddr_t *dpos);
|
|
int (*is_read)(rpcproc_t procnum);
|
|
int (*is_write)(rpcproc_t procnum);
|
|
int (*get_offset)(struct mbuf **md, caddr_t *dpos, int v3, struct
|
|
fha_info *info);
|
|
int (*no_offset)(rpcproc_t procnum);
|
|
void (*set_locktype)(rpcproc_t procnum, struct fha_info *info);
|
|
int (*fhe_stats_sysctl)(SYSCTL_HANDLER_ARGS);
|
|
};
|
|
|
|
struct fha_params {
|
|
struct fha_global g_fha;
|
|
struct sysctl_ctx_list sysctl_ctx;
|
|
struct sysctl_oid *sysctl_tree;
|
|
struct fha_ctls ctls;
|
|
struct fha_callbacks callbacks;
|
|
char server_name[32];
|
|
SVCPOOL **pool;
|
|
};
|
|
|
|
void fha_nd_complete(SVCTHREAD *, struct svc_req *);
|
|
SVCTHREAD *fha_assign(SVCTHREAD *, struct svc_req *, struct fha_params *);
|
|
void fha_init(struct fha_params *softc);
|
|
void fha_uninit(struct fha_params *softc);
|
|
int fhe_stats_sysctl(SYSCTL_HANDLER_ARGS, struct fha_params *softc);
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* _NFS_FHA_H_ */
|