Date: Thu, 28 Dec 2006 15:57:46 +0100 From: Steve Clement <steve@localhost.lu> To: freebsd-hackers@FreeBSD.org, freebsd-performance@FreeBSD.org Cc: sos@FreeBSD.org Subject: ICH7 IO Performance Issues Message-ID: <4593DB6A.7030208@localhost.lu>
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Hi list, I recently bought a New Asus W5F - 12" Laptop and am experiencing some issues with: If "Heavy" disk access occurs I experience overall system hangs Say I just compiled OpenOffice.Org and am happy all is fine so I can do a make clean. Make clean generates quite a lot of disk IO and everything begins lagging like: ls or playing an MP3 file. So I tried to reproduce this by doing the following: cat /dev/random > /tmp/junk_file didn't have the same effect, but I think that's because the source was not the local disk but fast memory a cp of a big file (1GB) didn't do anything BUT an rsync of that very same big file did give me hangs in my music at least so I catted big file attached it to now even bigger file and had some trouble too. The more I spawned IO Processes the badder it got. Is that a known issue? With 1.5Gb Ram there is for sure no way I ran out of Ram or any other memory issue (3Gig Swap) Also whilst rsyncing locally from disc to disc I noticed only between 10MB/s - 15MB/s throughput on average it did spike on 24MB during a few seconds. I seem to notice this issue quite often on FreeBSD, I had major RAID performance problems with a Rocket Raid adapter (ok I know it ain't the best but for what it's worth it should be more or less stable) Are there disk I/O issues on a larger scale maybe? Sincerely yours and willing to test/help, Steve Clement
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