kern/71968: [usb] USB disk triggers swap activity
Walter C. Pelissero
walter at pelissero.de
Tue Oct 5 03:00:47 PDT 2004
The following reply was made to PR kern/71968; it has been noted by GNATS.
From: "Walter C. Pelissero" <walter at pelissero.de>
To: freebsd-gnats-submit at FreeBSD.org,
Kris Kennaway <kris at obsecurity.org>, walter at pelissero.de
Subject: Re: kern/71968: [usb] USB disk triggers swap activity
Date: Tue, 5 Oct 2004 11:58:43 +0200
> > Sony Vaio PCG-XG9, LaCie 160G USB2 disk with UFS2 filesystem
> > mounted automatically by amd.
> > >Description:
> > When I do a substantial activity on a 160G USB2 disk the
> > system starts an heavy ATA disk activity that looks like
> > swapping because, even though there is still 50MB RAM
> > available, the swap usage jumps up to 14% and then slowly
> > reaches 17%. Soon, one by one, the programs become
> > irresponsive and the system grinds to a halt (but the ATA
> > activity). If I don't try it immediately, ssh from another
> > node yields a connection timeout. Needless to say the USB
> > keyboard and mouse die immediately, while I can still use the
> > trackpad on the laptop.
> > >How-To-Repeat:
> > dd if=/dev/zero of=/path/to/the/usb/filesystem
> Does the problem persist with 5.3?
Sorry for the late answer. It took me a while to upgrade to
I don't seem to be able to reproduce the problem under the new system,
so I'd consider this PR closed.
> Does 'top' or 'ps' show any unusual activity?
The swap stats above came indeed from top. It was indeed unusual for
me to see a stadily increasing swap allocation while still having 20%
of RAM untouched. In the meanwhile no process showed any substantial
increase in size.
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