| From: | Neil Bothwick |
| Date: | 4 May 2001 at 20:44:18 |
| Subject: | Re: Yam speeds |
Matt Sealey said,
> Hello G.A.Griggs
>> On one of my other list I regular recive e-mails of between 100k-700k. Now
>> I've noticed with Yam that when I download these large mails the transfer
>> speed goes up by about 3 cps per second. Afterwards if there are more mails
>> say from this list, which are only between 2k-4k the speed drops by about 3
>> cps per second. Is this just down to the nature of the net or is this a Yam
>> quirk. If the later is there a way of speeding up Yam apart from switching
>> to digest mode in my lists.
> Just a quirk of how your IP stack is doing TCP/IP, how the text is in
> larger chunks, how YAM's cps counter is implemented.
It's more a quirk of how YAM downloads mail.
Send RETR command
Store mail to disk
Send DELE command
Rinse and repeat
Only the second part is actually downloading, the rest of the time YAM
or the server are doing other things. With a typical mail size of 3-4K,
there's a lot of time spent on the housekeeping side of things, add a
couple of big mails and you can easily double the average throughput.
Cheers
Neil
Suborbital Ballistic-Propulsion Engineer
Not Exactly A Rocket Scientist
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