Messages in this thread | | | Date | Thu, 5 Aug 2004 04:32:28 -0700 (PDT) | From | mr <> | Subject | using isa - performance degrade? |
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hi all
i'm running 2.4.26 (debian) with sd's attached to an ncr53c8xx-scsi controller. since the sys is a p133 (the machine acts as a router/gw and knfs) performance isn't all the matters...but i was wondering..
if i would plug the vga-card to an isa slot(now unused& not compiled), one pci would get free to hold an AHA-2940 scsi controller, so i could split disks over the two scsihosts & add a few more. will the additional use of the isa-bus give me a performance impact?
sym0: <810> rev 0x2 on pci bus 0 device 12 function 0 irq 10 Vendor: IBM Model: DNES-309170 Rev: SA30 ANSI SCSI revision: 03 Vendor: QUANTUM Model: FIREBALL1080S Rev: 1Q09 ANSI SCSI revision: 02 Vendor: QUANTUM Model: VP32210 Rev: 81H8 ANSI SCSI revision: 02 Vendor: IBM Model: DDRS-34560 Rev: S97B ANSI SCSI revision: 02 another DDRS-34560...cdroms...
i won't have a problem with pci-throughput. afaik, with 33MHz-pci it shouldn't be a problem to get data from queries over the bus - those are not quite fast disks (hdparm -t 4,4MBs-fireball, 5,2MBs-VP, >8MBs-IBMs). since i also heard about poor performance of the adaptec-2940, will it be wise to use the second adapter?
another issue i'm poring about is using tagged command queueing(VP) / linked commands(fireball) on two disks holding a cache for squid on a reiserfs + swaps. will it improve performance or is the elevator/schedular enough? i know how to set command queueing at bootup but i'm clueless if there is a programm (scsi-tools? do i need sg?) to set various other options for the drives/host?
please cc to jkerdawn<at>yahoo.com -i've been on the list for a while, but the traffic..=(
thanks a lot & regards
ritch.
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