A few more data points on this issue: I've tried the 88SE9123 and the 88SE9125 card in a Windows XP machine (a relatively slow PCI-e gen1 box), and have these results: 2x 2G Hitachi drives connected via a SiI 3726, and to a SiI 3132: works for simultaneous reads with hdparm (for Windows - http://hdparm-win32.dyndns.org/hdparm/ - simultaneous read done with "start /b hdparm -t /dev/sdb & hdparm -t /dev/sdc" at windows command prompt) - read speeds at 60M per second on both drives. Reads from a single drive at 115M per second. Reads from a single drive (direct to host, not via PMP) at 117M per second. 2x 2G Hitachi drives connected via a SiI 3726, and to a SiI 3132 (Debian 6.0 2.6.32 NCQ depth any) - works for simultaneous reads with hdparm - read speeds at 60M per second on both drives. Reads from a single drive at 122M per second. Reads from a single drive (direct to host, not via PMP) at 121M per second. 2x 2G Hitachi drives connected via a SiI 3726, and to the 88SE9123 card (Windows XP mv91xx.sys v1.1.0.6 14-Feb-2011 ) - works for simultaneous reads with hdparm - read speeds at 60M per second on both drives. Reads from a single drive at 117M per second. Reads from a single drive (direct to host, not via PMP) at 130M per second. 2x 2G Hitachi drives connected via a SiI 3726, and to the 88SE9123 card ( Debian 6.0 2.6.32 NCQ depth 31 - same with any value between 2 and 31 ) - works for simultaneous reads with hdparm - read speeds at 30M per second on both drives. Reads from a single drive at 130M per second. Reads from a single drive (direct to host, not via PMP) at 130M per second. 2x 2G Hitachi drives connected via a SiI 3726, and to the 88SE9123 card ( Debian 6.0 2.6.32 NCQ depth 1 ) - works for simultaneous reads with hdparm - read speeds at 60M per second on both drives. Reads from a single drive at 130M per second. Reads from a single drive (direct to host, not via PMP) at 130M per second. 2x 2G Hitachi drives connected via a SiI 3726, and to the 88SE9125 card ( Debian 6.0 2.6.32 NCQ depth 31 - same with any value between 2 and 31 ) - works for simultaneous reads with hdparm - read speeds at 31M per second on both drives. Reads from a single drive at between 19M per second and 130M per second with NCQ depth = 31 (most often 130M), but reads from a single drive with NCQ depth = 2 varied between 5M per second and 54M per second. Reads from a single drive (direct to host, not via PMP) at 130M per second (127M per second with depth = 2). 2x 2G Hitachi drives connected via a SiI 3726, and to the 88SE9125 card ( Debian 6.0 2.6.32 NCQ 1 ) - works for simultaneous reads with hdparm - read speeds at 60M per second on both drives. Reads from a single drive at 130M per second. Reads from a single drive (direct to host, not via PMP) at 126M per second (consistantly 3M per second slower than via PMP!). Gotta dash, more testing later... Tim. -- South East Open Source Solutions Limited Registered in England and Wales with company number 06134732. Registered Office: 2 Powell Gardens, Redhill, Surrey, RH1 1TQ VAT number: 900 6633 53 http://seoss.co.uk/ +44-(0)1273-808309 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
