> "Ingo" == Ingo Molnar <[EMAIL PROTECTED]> writes:
Ingo> On Sun, 3 Sep 2000, Andi Kleen wrote:
>> I did the same for fragment RX some months ago (simple fragment
>> lists that were copy-checksummed to user space). Overall it is
>> probably better to use a kiovec, because that can be more ea
> "Jamie" == Jamie Lokier <[EMAIL PROTECTED]> writes:
Jamie> It's not faster than card->card DMA, which falls out naturally
Jamie> from my zero-copy proposal :-)
Except that many cards and PCI bridges don't work and you lose the
buffering aspect in this case.
Jes
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> "Ingo" == Ingo Molnar <[EMAIL PROTECTED]> writes:
Ingo> i believe such zero-copy send should only be allowed for drivers
Ingo> which can guarantee correct checksums. (ie. cards which do
Ingo> Tx-checksums) The other drivers will still copy. I dont think
Ingo> this is a problem - the number
> "Richard" == Richard Gooch <[EMAIL PROTECTED]> writes:
Richard> Andrew Morton writes:
>> All of them except the 3c905 provide hardware Rx and Tx
>> checksumming of IP, TCP and UDP headers. No 64 bit addressing
>> support.
Richard> And does the driver support it? Has anyone benchmarked the
>>>>> "Andrew" == Andrew Morton <[EMAIL PROTECTED]> writes:
Andrew> Jes Sorensen wrote:
>> I only know of a few 100baseT cards that can do it such as the
>> Adaptec Starfire and the 3C905B (though I am not sure what it
>> provides is sufficie
>>>>> "Ingo" == Ingo Molnar <[EMAIL PROTECTED]> writes:
Ingo> On 2 Sep 2000, Jes Sorensen wrote:
>> You can't DMA directly from a file cache page unless you have a
>> network card that does scatter/gather DMA and surprise surprise,
>
> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> There's been a few cards around since about 1995, but I don't
Jeff> remember all of them. I do remember having to debug SMP code on
Jeff> them though -- yec
I wouldn't be surprised but I would prefer names. Doing SMP aware
>>>>> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> Jes Sorensen wrote:
>> You just told us earlier in the thread that NetWare does direct
>> zero copy DMA but thats only half the story obviously. Up until the
>> era of G
> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> He said memory to memory transfers.
I also said data aquisition servers to data processing clients.
Jes
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> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> **ALL** Netware network drivers support a scatter/gather
Jeff> proramming interface, whether the hardware does or not. In
Jeff> NetWare, the drivers get passed a fragment list in what's called
Jeff> an ECB (Event Control Block). It
>>>>> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> Jes Sorensen wrote:
>> I'd love to see a netware box sustain 110MB/sec (MB as in mega
>> byte) memory to memory in two TCP streams between dual 400MHz P2
>> boxes.
Jeff>
> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
[since you like to forward things after sending me a private email, I'll
do the same].
Jeff> I wrote the SMP ODI networking layer in NetWare that used today by
Jeff> over 90,000,000 NetWare users. I also wrote the SMP LLC8022
Jeff> Stack
> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> all over the place that increases latency. Not to mention the
Jeff> overhead of the type of interrupt and trap gates that suck up
Jeff> about 50 clocks to fetch the IDT, PDE, and GDT tables for every
Jeff> interrupt. NetWare copies
> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> KDB is putrid. Can it debug double faults? NO. Can it debug
Jeff> complex register and numeric evaluation statements like IF ((EAX
Jeff> == 1) && [ESP-4] == 0x3000)? NO. Can it debug nested task gate
Jeff> exceptions? NO. Can
> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff, could you start by learning to quote email and not send a full
copy of the entire email you reply to (read rfc1855).
Jeff> The entire Linux Network subsystem needs an overhaul. The code
Jeff> copies data all over the place. I am at
> "Jeff" == Jeff V Merkey <[EMAIL PROTECTED]> writes:
Jeff> TRG has reprioritized it's long term objectives, and due to
Jeff> resource constraints and short term schedules, the Open Source
Jeff> NDS and Open Source NTFS File System projects are being
Jeff> withdrawn from the Linux Initiative.
> "Ingo" == Ingo Molnar <[EMAIL PROTECTED]> writes:
Ingo> On Sat, 2 Sep 2000, Dan Maas wrote:
>> There are various other tricks that can be done to speed up network
>> servers, like passing files directly from the buffer cache to the
>> network card. This one is currently frowned upon by the
> "David" == David S Miller <[EMAIL PROTECTED]> writes:
>Date: Fri, 1 Sep 2000 19:01:18 +0100 (BST) From: Alan Cox
> <[EMAIL PROTECTED]>
>o Acenic 0.45 fixes (Chip Salzenberg)
David> This adds a huge comment claiming to fix some race condition,
David> but no actual code is changed.
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