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From: Eric Dumazet <dada1@cosmosbay.com>
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: Johann Borck <johann.borck@densedata.com>,
	Ulrich Drepper <drepper@redhat.com>,
	Ulrich Drepper <drepper@gmail.com>,
	lkml <linux-kernel@vger.kernel.org>,
	David Miller <davem@davemloft.net>, Andrew Morton <akpm@osdl.org>,
	netdev <netdev@vger.kernel.org>,
	Zach Brown <zach.brown@oracle.com>,
	Christoph Hellwig <hch@infradead.org>,
	Chase Venters <chase.venters@clientec.com>
Subject: Re: [take19 1/4] kevent: Core files.
Date: Wed, 18 Oct 2006 06:45:35 +0200	[thread overview]
Message-ID: <4535B16F.7080208@cosmosbay.com> (raw)
In-Reply-To: <20061018041014.GA14588@2ka.mipt.ru>

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


  reply	other threads:[~2006-10-18  4:45 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <115a6230591036@2ka.mipt.ru>
2006-09-12  8:41 ` [take18 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-09-12  8:41   ` [take18 1/4] kevent: Core files Evgeniy Polyakov
2006-09-12  8:41     ` [take18 2/4] kevent: poll/select() notifications Evgeniy Polyakov
2006-09-12  8:41       ` [take18 3/4] kevent: Socket notifications Evgeniy Polyakov
2006-09-12  8:41         ` [take18 4/4] kevent: Timer notifications Evgeniy Polyakov
2006-09-20  9:35 ` [take19 0/4] kevent: Generic event handling mechanism Evgeniy Polyakov
2006-09-20  9:35   ` [take19 1/4] kevent: Core files Evgeniy Polyakov
2006-09-20  9:35     ` [take19 2/4] kevent: poll/select() notifications Evgeniy Polyakov
2006-09-20  9:35       ` [take19 3/4] kevent: Socket notifications Evgeniy Polyakov
2006-09-20  9:35         ` [take19 4/4] kevent: Timer notifications Evgeniy Polyakov
2006-10-04  6:34     ` [take19 1/4] kevent: Core files Ulrich Drepper
2006-10-04  6:48       ` Evgeniy Polyakov
2006-10-04 17:57         ` Ulrich Drepper
2006-10-05  8:57           ` Evgeniy Polyakov
2006-10-05  9:56             ` Eric Dumazet
2006-10-05 10:21               ` Evgeniy Polyakov
2006-10-05 10:45                 ` Eric Dumazet
2006-10-05 10:55                   ` Evgeniy Polyakov
2006-10-05 12:09                     ` Eric Dumazet
2006-10-05 12:37                       ` Evgeniy Polyakov
2006-10-15 23:22                         ` Ulrich Drepper
2006-10-16  7:33                           ` Evgeniy Polyakov
2006-10-16 10:16                             ` Ulrich Drepper
2006-10-16 11:23                               ` Evgeniy Polyakov
2006-10-17  5:10                           ` Johann Borck
2006-10-17  5:59                             ` Chase Venters
2006-10-17 10:42                               ` Evgeniy Polyakov
2006-10-17 13:12                                 ` Chase Venters
2006-10-17 13:35                                   ` Evgeniy Polyakov
2006-10-17 10:39                             ` Evgeniy Polyakov
2006-10-17 13:19                               ` Eric Dumazet
2006-10-17 13:42                                 ` Evgeniy Polyakov
2006-10-17 13:52                                   ` Eric Dumazet
2006-10-17 14:07                                     ` Evgeniy Polyakov
2006-10-17 14:25                                       ` Eric Dumazet
2006-10-17 15:09                                         ` Evgeniy Polyakov
2006-10-17 15:32                                           ` Eric Dumazet
2006-10-17 16:01                                             ` Evgeniy Polyakov
2006-10-17 16:26                                               ` Eric Dumazet
2006-10-17 16:35                                                 ` Evgeniy Polyakov
2006-10-17 16:45                                                   ` Eric Dumazet
2006-10-18  4:10                                                     ` Evgeniy Polyakov
2006-10-18  4:45                                                       ` Eric Dumazet [this message]
2006-10-17 15:33                                         ` Hans Henrik Happe
2006-10-05 14:01                 ` Hans Henrik Happe
2006-10-05 14:15                   ` Evgeniy Polyakov
2006-10-05 15:07                     ` Hans Henrik Happe
2006-09-22 19:22   ` [take19 0/4] kevent: Generic event handling mechanism Andrew Morton
2006-09-23  4:23     ` Evgeniy Polyakov
2006-10-04  6:09       ` Ulrich Drepper
2006-10-04  6:10         ` Ulrich Drepper
2006-10-04  6:27           ` Evgeniy Polyakov
2006-10-04  6:24         ` Evgeniy Polyakov
2006-09-26 15:54     ` Christoph Hellwig
2006-09-27  4:46       ` Evgeniy Polyakov
2006-09-27 15:09   ` Evgeniy Polyakov
2006-10-04  4:50     ` Ulrich Drepper
2006-10-04  4:55       ` Evgeniy Polyakov
2006-10-04  7:33         ` Ulrich Drepper
2006-10-04  7:48           ` Evgeniy Polyakov
2006-10-04 17:20             ` Ulrich Drepper
2006-10-05  9:02               ` Evgeniy Polyakov
2006-10-05 14:45                 ` Ulrich Drepper
2006-10-06  8:36                   ` Evgeniy Polyakov
2006-10-15 22:43                     ` Ulrich Drepper
2006-10-16  7:23                       ` Evgeniy Polyakov
2006-10-16  9:59                         ` Ulrich Drepper
2006-10-16 10:38                           ` Evgeniy Polyakov

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