On Wed, 18 Jul 2007, Rui Santos wrote:
Hi, I'm getting a strange slow performance behavior on a recently installed Server. Here are the details: Server: Asus AS-TS500-E4A Board: Asus DSBV-D ( http://uk.asus.com/products.aspx?l1=9&l2=39&l3=299&l4=0&model=1210&modelmenu=2 ) Hard Drives: 3x Seagate ST3400620AS ( http://www.seagate.com/ww/v/index.jsp?vgnextoid=8eff99f4fa74c010VgnVCM100000dd04090aRCRD&locale=en-US ) I'm using the AHCI driver, although with ata_piix, the behavior is the same. Here's some info about the AHCI controler:
With three disks, if everything was perfect yeah 120MB/s writes. When I had started out with 4 raptors I was getting 164MB/s read and write. By default with no optimizations you will not get good speed.
With no optimizations with 10 raptors I get 180-200MB/s, with optimizations, 464MB/s write and 622MB/s read.
1. Use XFS if you wan't speed. 2. Use 128k, 256k or 1MiB chunk size. 3. Use 8192k, 16384k stripe_cache_size. 4. Use 65536 readahead size. These are only some of the optimizations I use. Justin. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
