Messages in this thread | | | From | (Alan Cox) | Subject | Re: OSDI paper - IO-Lite: A Unified I/O Buffering and Caching System | Date | Wed, 3 Mar 1999 15:52:36 +0000 (GMT) |
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> dense but if I understand the paper correctly from the (casual I > admit) glance I had: > > 1. Most of the gains come from less copying along pipes.
Its worth noting Linus tried page tricks for pipe copying including doing copy-on-write stuff briefly and the only thing it improved where benchmarks
> 3. The gains come from copying by reference.
And you can do that with some kind of mmap() ring buffer protocol set up in advance in user space and avoid continually remapping
> the peer is transparent. I.e. the kernel converts it back to a normal > pipe on the fly. If that is the case couldn't this be also achieved by > some hands hake between the two processes?
Perhaps what you need is a mix - user->user is done via user handshaking protocols mostly (think about blocking I/O - there you want tiny bits of kernel help). user<->socket with some kind of ring buffer protocol would be the kernel talking it in that case
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