Packet loss every 30.999 seconds
Kostik Belousov
kostikbel at gmail.com
Wed Dec 19 10:24:54 PST 2007
On Wed, Dec 19, 2007 at 08:11:59PM +0200, Kostik Belousov wrote:
> On Wed, Dec 19, 2007 at 09:13:31AM -0800, David G Lawrence wrote:
> > > >Try it with "find / -type f >/dev/null" to duplicate the problem
> > > >almost
> > > >instantly.
> > >
> > > I was able to verify last night that (cd /; tar -cpf -) > all.tar would
> > > trigger the problem. I'm working getting a test running with
> > > David's ffs_sync() workaround now, adding a few counters there should
> > > get this narrowed down a little more.
> >
> > Unfortunately, the version of the patch that I sent out isn't going to
> > help your problem. It needs to yield at the top of the loop, but vp isn't
> > necessarily valid after the wakeup from the msleep. That's a problem that
> > I'm having trouble figuring out a solution to - the solutions that come
> > to mind will all significantly increase the overhead of the loop.
> > As a very inadequate work-around, you might consider lowering
> > kern.maxvnodes to something like 20000 - that might be low enough to
> > not trigger the problem, but also be high enough to not significantly
> > affect system I/O performance.
>
> I think the following may be safe. It counts only the clean scanned vnodes
> and does not evaluate the vp, that indeed may be reclaimed, after the sleep.
>
> I never booted with the change.
>
> diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
> index cbccc62..e686b97 100644
Or, better to use uio_yield(). See below.
diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
index cbccc62..5d2535f 100644
--- a/sys/ufs/ffs/ffs_vfsops.c
+++ b/sys/ufs/ffs/ffs_vfsops.c
@@ -1176,6 +1176,7 @@ ffs_sync(mp, waitfor, td)
struct ufsmount *ump = VFSTOUFS(mp);
struct fs *fs;
int error, count, wait, lockreq, allerror = 0;
+ int yield_count;
int suspend;
int suspended;
int secondary_writes;
@@ -1216,6 +1217,7 @@ loop:
softdep_get_depcounts(mp, &softdep_deps, &softdep_accdeps);
MNT_ILOCK(mp);
+ yield_count = 0;
MNT_VNODE_FOREACH(vp, mp, mvp) {
/*
* Depend on the mntvnode_slock to keep things stable enough
@@ -1233,6 +1235,12 @@ loop:
(IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) == 0 &&
vp->v_bufobj.bo_dirty.bv_cnt == 0)) {
VI_UNLOCK(vp);
+ if (yield_count++ == 500) {
+ MNT_IUNLOCK(mp);
+ yield_count = 0;
+ uio_yield();
+ goto relock_mp;
+ }
continue;
}
MNT_IUNLOCK(mp);
@@ -1247,6 +1255,7 @@ loop:
if ((error = ffs_syncvnode(vp, waitfor)) != 0)
allerror = error;
vput(vp);
+ relock_mp:
MNT_ILOCK(mp);
}
MNT_IUNLOCK(mp);
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-net/attachments/20071219/9839ef47/attachment.pgp
More information about the freebsd-net
mailing list