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Add warning about low KSTACK_PAGES for ZFS use

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As ZFS requires a more kernel stack pages than is the default on some
architectures e.g. i386, warn if KSTACK_PAGES is less than
ZFS_MIN_KSTACK_PAGES (which is 4 at the time of writing).

MFC after:	3 days
Sponsored by:	Multiplay
This commit is contained in:
smh 2015-07-28 11:19:38 +00:00
parent e348ebeae9
commit fe8376640c
2 changed files with 16 additions and 0 deletions
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8
UPDATING
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@ -31,6 +31,14 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 11.x IS SLOW:
disable the most expensive debugging functionality run
"ln -s 'abort:false,junk:false' /etc/malloc.conf".)
20150728:
As ZFS requires a more kernel stack pages than is the default on some
architectures e.g. i386, it now warns if KSTACK_PAGES is less than
ZFS_MIN_KSTACK_PAGES (which is 4 at the time of writing).
Please consider using 'options KSTACK_PAGES=X' where X is greater
than or equal to ZFS_MIN_KSTACK_PAGES i.e. 4 in such configurations.
20150706:
sendmail has been updated to 8.15.2. Starting with FreeBSD 11.0
and sendmail 8.15, sendmail uses uncompressed IPv6 addresses by

8
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c
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@ -6491,10 +6491,18 @@ static void zfs_shutdown(void *, int);
static eventhandler_tag zfs_shutdown_event_tag;
#define ZFS_MIN_KSTACK_PAGES 4
int
zfs__init(void)
{
#if KSTACK_PAGES < ZFS_MIN_KSTACK_PAGES
printf("ZFS NOTICE: KSTACK_PAGES is %d which could result in stack "
"overflow panic!\nPlease consider adding "
"'options KSTACK_PAGES=%d' to your kernel config\n", KSTACK_PAGES,
ZFS_MIN_KSTACK_PAGES);
#endif
zfs_root_token = root_mount_hold("ZFS");
mutex_init(&zfs_share_lock, NULL, MUTEX_DEFAULT, NULL);