Date: Sun, 10 Feb 2002 11:11:24 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Mike Silbersack <silby@silby.com> Cc: Valentin Nechayev <netch@iv.nn.kiev.ua>, "David W. Chapman Jr." <dwcjr@inethouston.net>, <stable@FreeBSD.ORG> Subject: Re: cvs commit: src/sys/ufs/ffs ffs_softdep.c Message-ID: <200202101911.g1AJBOk30917@apollo.backplane.com> References: <20020210113348.P28078-100000@patrocles.silby.com>
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:...
:> directories), but all games used only correct syscall entries and their calls.
:> There was 2 occurences of another variant: __after__ message "Syncing disks...
:> N M\nDone\n", disk activity raised and on 2nd occurence stopped after
:> ~10 seconds, on 1st occurence I wait more than 1 minute for it to terminate
:> and at the end pressed Reset.
:
:Yes, I noticed this problem again as well. As you say, it only happens if
:there has been significant activity right before the shutdown. I didn't
:grab a crashdump as I was more worried about what I was testing at the
:time.
:
:Matt, can you reproduce the problem over by you? It seems that doing
:anything disk intensive and then shutting down immediately will trigger
:it.
:
:Mike "Silby" Silbersack
Hmm. I will attempt to reproduce the problem. How much activity is
'significant' ? e.g. equivalent of an rm -rf /usr/ports or something
smaller? Do the directories have to be deeply nested for the problem
to occur?
On the second issue - long disk activity times after a 'syncing disks...
done'. This can occur if there are a lot of dirty VM pages in the
system belonging to files that need to be written out. This can take an
especially long time if a large file was created with ftruncate()
and written via mmap() instead of write(), because the file can become
severely fragmented.
-Matt
Matthew Dillon
<dillon@backplane.com>
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