From: Grant Edwards <grante@visi.com>
To: ecos-discuss@sources.redhat.com
Subject: [ECOS] RedBoot network timer question
Date: Thu, 18 Jan 2001 14:57:00 -0000 [thread overview]
Message-ID: <20010118170204.A10344@visi.com> (raw)
Are the following observations correct?
1) The network code keeps track of millisecond "ticks" by
delaying for 1ms and incrementing a counter every time any
of the code uses the MS_TICKS() to check the current time.
2) But, the network polling code is only called once every
250ms [the timeout value passed to gets() by the main
loop]. I verified this by pinging the board and response
times varied from 4m to 290ms with a mean of 144ms.
3) That means that the network time only increments by a few
milliseconds once every 250ms. Time would appear to pass
very slowly to the network routines, making the TCP
timeouts longer by a factor of about 100.
--
Grant Edwards
grante@visi.com
next reply other threads:[~2001-01-18 14:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-18 14:57 Grant Edwards [this message]
2001-01-18 15:35 ` Gary Thomas
2001-01-19 8:23 ` Grant Edwards
2001-01-19 10:45 ` Hugo Tyson
2001-01-19 11:29 ` Grant Edwards
2001-01-19 13:33 ` [ECOS] No simulator in gdb target list Sergei Slobodov
2001-01-21 10:18 ` Jonathan Larmour
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