On Sun, 29 Nov 1998, Anthony Rumble wrote:
> On Sat, 28 Nov 1998, Ralf S. Engelschall wrote:
>
> > > Im wondering how badly mod_perl will fragment up writes without writev
> > > support..
> >
> > Don't know, I've never did any performance tests.
> >
> > > Maby Ill have to run two servers for now.. one with ssl and no writev, and
> > > one without ssl with writev... as most of the work is done without SSL..
> >
> > Hmmmm.... I would first check whether the not used writev() is really a
> > network performance problem. Usually Apache's performance penalties exists at
> > other corners, AFAIK.
>
> I will try and do some testing..
>
> The fear is that each write calles generates a TCP packet.. which is very
> bad indeed as the overheads for TCP are quite large.. For users on slow
> links (which is a fact of life here in Australia), it can be disastrous..
Well, the good news is.. it doesn't matter. (Not for mod_perl anyway,
which is what I am interested in).. It would have an impact on mod_include
stuff though..
Heres the strace from the bog standard RedHat apache 1.3.3 with mod_perl
write(4, "HTTP/1.1 200 OK\r\nDate: Sun, 29 Nov 1998 06:53:19
GMT\r\nServer: Apac
he/1.3.3 (Unix) (Red Hat/Linux) mod_perl/1.15\r\nPragma:
no-cache\r\nExpires: 0
\r\nCache-Control: no-cache\r\nConnection: close\r\nContent-Type:
text/html\r\n\
r\n<script language=\"Java"..., 821) = 821
The whole page all in one write.. very nice..
Now for Apache 1.3.3 mod_perl and mod_ssl..
write(4, "HTTP/1.1 200 OK\r\nDate: Sun, 29 Nov 1998 06:58:37
GMT\r\nServer: Apac
he/1.3.3 (Unix) (Red Hat/Linux) mod_ssl/2.1.0 SSLeay/0.9.0b
mod_perl/1.16\r\nPr
agma: no-cache\r\nExpires: 0\r\nCache-Control: no-cache\r\nConnection:
close\r\n
Content-Type: text/html\r\n"..., 849) = 849
All in one write as well.. seems that apache buffers mod_perl stuff just
like CGI.
This is good, so I don't need to run dual servers now.. <phew>
---
Anthony Rumble
EMUSYS Unix Consulting Phone: 0500 500 EMU
Direct 02-9798-7604 Mobile 0412-955-042 Fax 02 9798 2854
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