Date: Thu, 22 Jan 2004 12:09:19 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Ian Freislich <if@hetzner.co.za> Cc: current@freebsd.org Subject: Re: Is BUFSIZ too small ? Message-ID: <20040122180918.GA94901@dan.emsphone.com> In-Reply-To: <E1AjcbI-00050I-00@hetzner.co.za> References: <98907.1074546817@critter.freebsd.dk> <E1AjcbI-00050I-00@hetzner.co.za>
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In the last episode (Jan 22), Ian Freislich said: > "Poul-Henning Kamp" wrote: > > In message <200401192111.i0JLBYVk004060@apollo.backplane.com>, Matthew Dillon > > writes: > > >:I noticed that we still have BUFSIZ in stdio.h defined to only > > >:1024, and wonder if that should be increased these days. > > >: > > >:Is there anybody who could devise and run some benchmarks to find > > >:out what effect it would have to increase it to for instance > > >:4096? > > > > > > Very few programs use BUFSIZ for the actual I/O ops [...] > > > > I share many of your doubts, but I would still like to see some > > benchmarks :-) > > Perhaps ftp is one of those things that uses BUFSIZ for the actual > I/O ops. All of it's reads and writes if you truss it are 1024 bytes > which impacts its performance (here at least). Yeah, it's not so much stdio's use of BUFSIZ, it's other applications using it for their preferred I/O size. I upped the buffer size in ftpd locally because of this. There are a lot of references to BUFSIZ in the base system's code, but they're mainly just for reading in a config file, for example, or misused as sizing a filename buffer. ftpd and lpr jumped out as really wanting larger I/O sizes. -- Dan Nelson dnelson@allantgroup.com
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