Messages in this thread |  | | Date | Mon, 30 Oct 2000 01:08:08 -0700 | From | "Jeff V. Merkey" <> | Subject | Re: 2.2.18Pre Lan Performance Rocks! |
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On Mon, Oct 30, 2000 at 09:39:37AM +0100, Ingo Molnar wrote: > > On Mon, 30 Oct 2000, Jeff V. Merkey wrote: > > > Is there an option to map Linux into a flat address space [...] > > nope, Linux is fundamentally multitasked. > > what you can do to hack around this is to not switch to the idle thread > after having done work in nfsd. Some simple & stupid thing in schedule: > > if (next == idle_task) { > while (nr_running) > barrier(); > goto repeat_schedule; > } > > (provided you are testing this on a UP system.) This way we do not destroy > the TLB cache when we wait a few microseconds for the next network > interrupt. > > we do this in 2.4 already - ie. nfsd doesnt have to mark itself lazy-MM, > the idle thread will automatically 'inherit' the MM of nfsd, and is going > to switch CR3 only if the next process is not nfsd. So you can get an > apples to apples comparison by using 2.4.
Ingo, I will attempt this, but I doubt seriously it will allow Linux to defeat NetWare 5.x on LAN I/O scaling. ALl protection has to go away in all LAN paths for this to happen, and user space apps set to ring 0. NetWare 5.cx does support ring 3 applications, but the model is different than Linux. I will look at a potential compromise between the two with the MANOS /arch merge. It may allow some incarnation of Linux to smoke NetWare 5.x on LAN performance. Doing this would move MARS-NWE and SAMBA into the kernel without changing a line of code in either...
Jeff
> > Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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