Older blog entries for davem (starting at number 5)

Andrew broke 3c59x.c on non-little-endian machines and those not supporting virt_to_bus/bus_to_bus in pre6-6, I've let him know about this. :-)
Starting to make more progress on my VM hacks, the anon layer was just the beginning. I hope after the 2nd or 3rd pot of coffee tonight I should have something that at least remotely resembles what I want it all to look like. If I arrive at something people can at least play with, I'll post patches.
The Sun IFB/Expert3D card turns out to be an Intense3D chipset (the Wildcat 4110). Their site claims a Linux driver around the summer, but I bet the fucks will do binary only x86 drivers which essentially screws over any chance of legitimate Sparc/Linux support.

Finally got to finishing half of the SKFP portability stuff.
Merged current tree to Linus.
Wrote an anon page layer for the Linux vm. It works, no leaks, no bugs, etc.
Older UltraSparc firmware aparently writes out the "assigned-address" PCI device properties incorrectly for 64-bit MEM space resources. I hate having to write workarounds for crap like this. Nice spotting on this one by Matt Jacob.
Jens is making nice progress on the elevator performance fixups. The one issue we really haven't looked deeply into is how the elevator interacts with the queue plugging, as done by the scsi layer. He is off checking this out already :-)
Went to Santa Cruz with the wife, stuffed ourselves with fish, listened to the sea lions growl, watched the surfers, and came home.

Jens is interested in improving elevator now too :-) Really, the problem is the missed coalescing, the latency concept is not fundamentally broken. The algorithm can get a lot of both worlds by coalescing whenever possible. In this way it performs latency reduction on groups of requests instead of on a per-request basis.

Got distracted for two days working on a prototype fibre channel card, can't talk much about it, but I can say there'll be a Linux driver for this beast :-)

Sun released their IFB (aka. "Expert 3D") graphics card yesterday. It's a bit pricey, but I'm so itching to do a Linux driver for it I may just end up buying one.

The cscope release made Larry McVoy nearly wet his pants.

I think I know why Andrea's new elevator code is so much worse than 2.2.x's disk sorting. The general scheme of the elevator is to keep low the latency introduced to old requests by new requests being added. In doing this, it prevents merging with other requests to the same area of the disk. In actuality this "latency reduction" is really increasing latency, because a missed merge means it will now take two I/O operations to move data which could have been done by a single request. Also, since the elevator will move the I/O request towards the end of the I/O queue, it is almost certain that requests to other sectors will happen first, thus an unnecessary disk seek. I have no idea why the elevator make LVM/IDE dbench runs faster for him, as it seems quite wrong fundamentally.
Will study this more soon.

Just ignore rth, he's jelous or something I suppose. :-)

Cobbled together 2.2.15pre fixes for Alan, sent them off. The Netra-T1 irq probing bug and the sym896 issues on sparc64 should now be cured, as is the double poll_wait problem in sbus audio.

Watched the demo of the RazerCPL quake3 final match between nb.fatal1ty and D16-Makaveli. Fate has some insane new moves in q3dm13 I've never seen before, the best was the double RL jump out of the basement lava back safely to the second level. He tried it again later in the match but didn't have enough health to pull it off :-)

Head of TODO List: SKFP driver portability work.

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