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SubjectRe: Marvell 88SX7042 [4 Port SATA PCI-Express x4] Support/Questions
Justin Piszcz wrote:
> Jeff has been working on this chipset/patching/etc:
..

Actually, I'm the one working on that chipset etc.. :)

> Looks like there are a couple cards sporting this new chip at the moment
..

There are lots of them out there, including Sonnet, Highpoint, and others.

> If one bought enough of these, one could possibly achieve speeds in
> excess(!) of 1 gigabyte/second with enough drives and SW RAID in Linux.
> Does anyone have such a card? I would be interested if it could sustain
> the maximum rate from each disk without any contention.
..

Sure, if the bus and memory are fast enough. You'll hit the Linux/libata
transactions/sec limit at some point, but I don't know what that is.

Eg. Here's a 4X (I think) card in my PCIe video slot:

beefy:~# mdadm --create /dev/md0 --chunk=256 -l 0 --raid-devices=4 /dev/sd[bcde]
mdadm: array /dev/md0 started.

beefy:~# hdparm -t --direct /dev/sd[bcde] /dev/md0

/dev/sdb:
Timing O_DIRECT disk reads: 218 MB in 3.01 seconds = 72.46 MB/sec

/dev/sdc:
Timing O_DIRECT disk reads: 256 MB in 3.01 seconds = 85.00 MB/sec

/dev/sdd:
Timing O_DIRECT disk reads: 192 MB in 3.01 seconds = 63.79 MB/sec

/dev/sde:
Timing O_DIRECT disk reads: 256 MB in 3.01 seconds = 85.07 MB/sec

/dev/md0:
Timing O_DIRECT disk reads: 768 MB in 3.00 seconds = 255.69 MB/sec

Similar results happen without the "--direct" flag as well.

> 2. How 'experimental' is it?

The 7042 chipset is working rather well right now.
Older Marvell chips should still be considered "experimental"
for the time being.

Cheers


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