From: Corey Minyard <minyard@acm.org>
To: Zwane Mwaikambo <zwane@linux.realnet.co.sz>
Cc: "Richard B. Johnson" <root@chaos.analogic.com>,
Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: TCP/IP Speed
Date: Wed, 30 Jan 2002 12:07:17 -0600 [thread overview]
Message-ID: <3C583655.6060707@acm.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0201301831120.5518-100000@netfinity.realnet.co.sz>
Zwane Mwaikambo wrote:
>On Wed, 30 Jan 2002, Richard B. Johnson wrote:
>
>>But it's already connected.
>>
>>
>> host:
>> for (;;) {
>> gettimeofday(...);
>> write(s, buf, 64);
>> read(s, buf, sizeof(buffer));
>> gettimeofday(...);
>> /* delay is 1.0 ms */
>> }
>> server is IPPORT_ECHO
>>
>
>You didn't make that explicit in your previous email, and anyway what kind
>of resolution can you expect from gettimeofday...
>
Depending on the processor, gettimeofday has very high resolution.
If I remember correctly, the TCP stacks put in delays for small sends so
they can pack multiple things together. I think there are ways to work
around this via some type of flush, but memory fails me on exactly how.
-Corey
next prev parent reply other threads:[~2002-01-30 18:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-30 16:07 TCP/IP Speed Richard B. Johnson
2002-01-30 16:14 ` Zwane Mwaikambo
2002-01-30 16:35 ` Richard B. Johnson
2002-01-30 16:31 ` Zwane Mwaikambo
2002-01-30 16:47 ` Richard B. Johnson
2002-01-30 16:45 ` Zwane Mwaikambo
2002-01-31 14:00 ` Terje Eggestad
2002-01-31 15:26 ` Richard B. Johnson
2002-01-31 16:06 ` Terje Eggestad
2002-01-30 18:07 ` Corey Minyard [this message]
2002-01-30 18:20 ` Tobias Ringstrom
2002-01-30 18:24 ` Gregory Maxwell
2002-01-30 16:36 ` Zwane Mwaikambo
2002-01-30 21:24 ` Rob Landley
2002-01-30 21:54 ` Richard B. Johnson
2002-01-30 21:58 ` David S. Miller
2002-01-31 13:33 ` Gregory Maxwell
[not found] <fa.kdqjrkv.1d44lam@ifi.uio.no>
2002-01-30 18:18 ` Dan Maas
2002-01-30 18:34 ` Richard B. Johnson
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