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pxeboot: Add nfs.read_size tunable.

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Increase this tunable improves kernel loading speed.

Submitted by:	Jun Su <junsu microsoft com>
Reviewed by:	rpokala, wblock (previous version)
Obtained from:	DragonFlyBSD
MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D7756
This commit is contained in:
Sepherosa Ziehau 2016-09-08 09:11:13 +00:00
parent b33720da59
commit ff9eac2e6d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=305588
2 changed files with 32 additions and 9 deletions
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33
lib/libstand/nfs.c
View File

@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
#include <sys/socket.h>
#include <sys/stat.h>
#include <string.h>
#include <stddef.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
@ -50,7 +51,8 @@ __FBSDID("$FreeBSD$");
#define NFS_DEBUGxx
#define NFSREAD_SIZE 1024
#define NFSREAD_MIN_SIZE 1024
#define NFSREAD_MAX_SIZE 4096
/* Define our own NFS attributes without NQNFS stuff. */
#ifdef OLD_NFSV2
@ -83,7 +85,7 @@ struct nfs_read_repl {
n_long errno;
struct nfsv2_fattrs fa;
n_long count;
u_char data[NFSREAD_SIZE];
u_char data[NFSREAD_MAX_SIZE];
};
#ifndef NFS_NOSYMLINK
@ -210,6 +212,8 @@ struct fs_ops nfs_fsops = {
nfs_readdir
};
static int nfs_read_size = NFSREAD_MIN_SIZE;
#ifdef OLD_NFSV2
/*
* Fetch the root file handle (call mount daemon)
@ -264,6 +268,17 @@ nfs_getrootfh(struct iodesc *d, char *path, u_char *fhp)
if (repl->errno)
return (ntohl(repl->errno));
bcopy(repl->fh, fhp, sizeof(repl->fh));
/*
* Improve boot performance over NFS
*/
if (getenv("nfs.read_size") != NULL)
nfs_read_size = strtol(getenv("nfs.read_size"), NULL, 0);
if (nfs_read_size < NFSREAD_MIN_SIZE)
nfs_read_size = NFSREAD_MIN_SIZE;
if (nfs_read_size > NFSREAD_MAX_SIZE)
nfs_read_size = NFSREAD_MAX_SIZE;
return (0);
}
@ -401,11 +416,11 @@ nfs_readdata(struct nfs_iodesc *d, off_t off, void *addr, size_t len)
bcopy(d->fh, args->fh, NFS_FHSIZE);
args->off = htonl((n_long)off);
if (len > NFSREAD_SIZE)
len = NFSREAD_SIZE;
if (len > nfs_read_size)
len = nfs_read_size;
args->len = htonl((n_long)len);
args->xxx = htonl((n_long)0);
hlen = sizeof(*repl) - NFSREAD_SIZE;
hlen = offsetof(struct nfs_read_rpl, data[0]);
cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
args, sizeof(*args),
@ -1025,7 +1040,7 @@ nfs_readdata(struct nfs_iodesc *d, off_t off, void *addr, size_t len)
uint32_t count;
uint32_t eof;
uint32_t len;
u_char data[NFSREAD_SIZE];
u_char data[NFSREAD_MAX_SIZE];
} *repl;
struct {
uint32_t h[RPC_HEADER_WORDS];
@ -1048,10 +1063,10 @@ nfs_readdata(struct nfs_iodesc *d, off_t off, void *addr, size_t len)
pos = roundup(d->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
args->fhoffcnt[pos++] = 0;
args->fhoffcnt[pos++] = htonl((uint32_t)off);
if (len > NFSREAD_SIZE)
len = NFSREAD_SIZE;
if (len > nfs_read_size)
len = nfs_read_size;
args->fhoffcnt[pos] = htonl((uint32_t)len);
hlen = sizeof(*repl) - NFSREAD_SIZE;
hlen = offsetof(struct repl, data[0]);
cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_READ,
args, 4 * sizeof(uint32_t) + roundup(d->fhsize, sizeof(uint32_t)),

8
sys/boot/i386/pxeldr/pxeboot.8
View File

@ -85,6 +85,14 @@ expects to fetch
.Pa /boot/loader.rc
from the specified server before loading any other files.
.Pp
.Nm
defaults to a conservative 1024 byte NFS data packet size.
This may be changed by setting the
.Va nfs.read_size
variable in
.Pa /boot/loader.conf .
Valid values range from 1024 to 4096 bytes.
.Pp
In all other respects,
.Nm
acts just like