On 01/18/10 22:13, O. Hartmann wrote:
Symptome: All boxes have ZFS and UFS2 filesystems. Since two weeks or so, sometimes the I/O performance drops massively when doing 'svn update', 'make world' or even 'make kernel'. It doesn't matter what memory and how many cpu the box has, it get stuck for several seconds and freezing. On the UP box, this is sometimes for 10 - 20 seconds. A very interesting phenomenon is the massively delayed file writing on ZFS filesystems I realise. Editing a file in 'vi' running on one XTerm and having in another Xterminal my shell for compiling this file, it takes sometimes up to 20 seconds to get the file updated after it has been written. It's like having an old, slow NFS connection with long cache delays. These massively delayed file transactions are not necessarely under heavy load, sometimes they occur in a relaxed situation. They seem to occur much more often on the UP box than on the SMP boxes, but this strange phenomenon also occur on the Dell Poweredge II, which has 16GB RAM and summa summarum 16 cores. This phenomenon does occur on ZFS- and UFS2 filesystems as well. It is hardly reproducable.
I'm experiencing the same thing, except in my case it's most noticeable when writing to a USB flash drive with a FAT32 filesystem. It slows the entire system down, even if the data being written is coming from cache or a memory file system.
I don't know if it's related. I'm running 8-STABLE from about 4 December. Regards, Aragon _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
