Messages in this thread | | | Date | Wed, 18 Oct 2006 06:45:35 +0200 | From | Eric Dumazet <> | Subject | Re: [take19 1/4] kevent: Core files. |
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Evgeniy Polyakov a e'crit : > On Tue, Oct 17, 2006 at 06:45:54PM +0200, Eric Dumazet (dada1@cosmosbay.com) wrote: >> I am not sure I understand what you wrote, English is not our native language. >> >> I think many people gave you feedbacks. I feel that all feedback on this >> mailing list is constructive. Many posts/patches on this list are never >> commented at all. > > And I do greatly appreciate feedback from those people! > > But I do not understand why I never got feedback on initial design and > implementation (and then created as far as I recall at least 10 > releases) from Ulrich, who first asked for such a feture. > So right now I'm waiting for his opinion on that problem, even if it will > be 'it sucks' again, but at least in that case I will not waste people's time. > > Ulrich, could you please comment on design notes sent couple of mail > above?
Ulrich is a very busy man. We have to live with that.
<rant_mode> For example, I *complained* one day, that each glibc fopen()/fread()/fclose() pass does a mmap()/munmap() to obtain a single 4KB of memory, without any cache mechanism. This badly hurts performance of multi-threaded programs as we know mmap()/munmap() has to down_write(&mm->mmap_sem); and play VM games.
So to avoid this, I manually call setvbuf() in my own programs, to provide a suitable buffer to glibc, because of its suboptimal default allocation, vestige of an old epoch... </rant_mode>
Eric
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