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Reduce the limit of vnodes on i386 when ZFS is loaded to 3/4 of the original

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value, so we don't run out of KVA. The default vnodes limit fits better for
UFS, but ZFS allocated more file system specific memory for a vnode than UFS.

Don't touch vnodes limit if we detect it was tuned by system administrator
and restore original value when ZFS is unloaded.

This isn't final fix, but before we implement something better, this will
help to stabilize ZFS under heavy load on i386.

Approved by:	re (bmah)
This commit is contained in:
Pawel Jakub Dawidek 2007-09-10 19:58:14 +00:00
parent 18928d0deb
commit a3c8c2e60f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=172135
2 changed files with 82 additions and 0 deletions
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41
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
View File

@ -949,6 +949,39 @@ zfs_freevfs(vfs_t *vfsp)
atomic_add_32(&zfs_active_fs_count, -1);
}
#ifdef __i386__
static int desiredvnodes_backup;
#endif
static void
zfs_vnodes_adjust(void)
{
#ifdef __i386__
int val;
desiredvnodes_backup = desiredvnodes;
/*
* We calculate newdesiredvnodes the same way it is done in
* vntblinit(). If it is equal to desiredvnodes, it means that
* it wasn't tuned by the administrator and we can tune it down.
*/
val = min(maxproc + cnt.v_page_count / 4, 2 * vm_kmem_size /
(5 * (sizeof(struct vm_object) + sizeof(struct vnode))));
if (desiredvnodes == val)
desiredvnodes = (3 * desiredvnodes) / 4;
#endif
}
static void
zfs_vnodes_adjust_back(void)
{
#ifdef __i386__
desiredvnodes = desiredvnodes_backup;
#endif
}
void
zfs_init(void)
{
@ -964,6 +997,13 @@ zfs_init(void)
* Initialize znode cache, vnode ops, etc...
*/
zfs_znode_init();
/*
* Reduce number of vnodes. Originally number of vnodes is calculated
* with UFS inode in mind. We reduce it here, because it's too big for
* ZFS/i386.
*/
zfs_vnodes_adjust();
}
void
@ -971,6 +1011,7 @@ zfs_fini(void)
{
zfsctl_fini();
zfs_znode_fini();
zfs_vnodes_adjust_back();
}
int

41
sys/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c
View File

@ -949,6 +949,39 @@ zfs_freevfs(vfs_t *vfsp)
atomic_add_32(&zfs_active_fs_count, -1);
}
#ifdef __i386__
static int desiredvnodes_backup;
#endif
static void
zfs_vnodes_adjust(void)
{
#ifdef __i386__
int val;
desiredvnodes_backup = desiredvnodes;
/*
* We calculate newdesiredvnodes the same way it is done in
* vntblinit(). If it is equal to desiredvnodes, it means that
* it wasn't tuned by the administrator and we can tune it down.
*/
val = min(maxproc + cnt.v_page_count / 4, 2 * vm_kmem_size /
(5 * (sizeof(struct vm_object) + sizeof(struct vnode))));
if (desiredvnodes == val)
desiredvnodes = (3 * desiredvnodes) / 4;
#endif
}
static void
zfs_vnodes_adjust_back(void)
{
#ifdef __i386__
desiredvnodes = desiredvnodes_backup;
#endif
}
void
zfs_init(void)
{
@ -964,6 +997,13 @@ zfs_init(void)
* Initialize znode cache, vnode ops, etc...
*/
zfs_znode_init();
/*
* Reduce number of vnodes. Originally number of vnodes is calculated
* with UFS inode in mind. We reduce it here, because it's too big for
* ZFS/i386.
*/
zfs_vnodes_adjust();
}
void
@ -971,6 +1011,7 @@ zfs_fini(void)
{
zfsctl_fini();
zfs_znode_fini();
zfs_vnodes_adjust_back();
}
int