Date: Thu, 11 Mar 2010 17:16:35 -0600 From: Adam Vande More <amvandemore@gmail.com> To: David Jackson <djackson452@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Severe instabilities and system lockups Message-ID: <6201873e1003111516r6aac4555t407ea1e4522c4749@mail.gmail.com> In-Reply-To: <4B997730.8070009@gmail.com> References: <4B952B38.70308@gmail.com> <4B997730.8070009@gmail.com>
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On Thu, Mar 11, 2010 at 5:05 PM, David Jackson <djackson452@gmail.com>wrote: > David Jackson wrote: > >> I am still having severe problems with severe system instabilities with >> FreeBSD and have had these problrms in 7.1 and 8.0. The system randomly >> locks up, it appears applications lock up when they access the USb disk. >> Also, when accessing the USB disk, the entire system lockup often for >> minutes. Performance with accessing USB disks is horrendous,. it took 7 >> hours to copy a directory that was 200 MB. Any program that accesses the USB >> disk tend to freeze for minutes, and often the entire system becomes >> unresponsive for minutes. Overall FreeBSD here is characterized by severe >> instabilities, ive had better performance from Windows 98 systems. The fact >> that the entire system freezes up, this should not happen, a well designed >> system will not lock up the entire OS when accessing disk. >> >> Are there any diagnostic tools uch as getting a log of tranmissions on USB >> and probe it, ,or finmd out what code it is lockilng up on ?Has anyone else >> seen these problems with USB disks? >> > Thank you for the reply to my concerns. I have been reading through them > carefully. > > I seem to have also discovered that the lockup problems are not entirely > due to USB issues. Many of them were being caused by an apparent problem > with the swap system. I have two swaps, a file backed swap and a partition > swap on the same disk. Apparently when having two swaps on the disk there > are severe performance problems. FreeBSD needs to fix whatever is causing > this thrashing problem. So far the lockups have seem to become much less > severe since i have disabled the file based swap file. I may disable the > partition swap but i do not know if it is possible to have the system boot > with a file based swap only. Perhaps i can disable the partition swap after > it boots. > > I am trying to copy a directory on the USB drive however and it does seem > to be rather slow still. It started at 5:45 and is still going. I will see > how long it takes. > > > Again thanks for the help with these issues It's unclear how this system is being used, but if swap is being frequently accessed that's a problem your usage, not freebsd in particular. If your swap is being accessed frequently in any OS you should expect a serious performance hit. If that is the case you should investigate reducing memory usage/adding more in. -- Adam Vande More
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