Re: [SQU] Performance Question

Henrik,

I think you are absolutely correct about having proxies can increase the
utilization of the link. Especially, if we use Microsoft products. As we
knew, that Microsoft TCP/IP had bugs to compute RTT (I fixed already since
they release SP6, thanks Microsoft !).

However, When I compare Linux, Mac, and MS Windows to browse (W/O proxy).
Microsoft still has the worst performance (sorry Microsoft !). After I use
proxy, all of OS have same performance (they read from local HDD / RAM).

I am not sure about this symptom, but that is my experience.

Best Regards,

Awie
awie@eksadata.com
PT. EKSADATA INTISOLUSI
Phone : (62-361) 261514
Mobile1 : (62-82) 3610369
Mobile2 : (62-818) 346241
----- Original Message -----
From: "Awie" <awie@eksadata.com>
To: "Henrik Nordstrom" <hno@hem.passagen.se>; "Audie Pierre"
<audiep@vescomamerica.com>; "Jimmy Megantara" <jimmy@eksadata.com>
Cc: <squid-users@ircache.net>
Sent: Thursday, November 02, 2000 10:31 AM
Subject: Re: [SQU] Performance Question

> Henrik,
>
> I implement the TCP header compression before I use Squid. The reasons
were:
>
> 1. Bandwidth cost is very high.
> 2. Our users data "payload" is very variable.
>
> Of course, our remote link should apply the TCP header compression (they
use
> same router; CISCO). Fortunately, our remote link also used Squid in
Solaris
> environment.
>
> It seems our system runs well. I configure Squid as transparent proxy with
> Brian's and your assist.
>
> Thx
>
>
> Best Regards,
>
> Awie
> awie@eksadata.com
> PT. EKSADATA INTISOLUSI
> Phone : (62-361) 261514
> Mobile1 : (62-82) 3610369
> Mobile2 : (62-818) 346241
> ----- Original Message -----
> From: "Henrik Nordstrom" <hno@hem.passagen.se>
> To: "Awie" <awie@eksadata.com>
> Cc: <squid-users@ircache.net>
> Sent: Wednesday, November 01, 2000 1:03 AM
> Subject: Re: [SQU] Performance Question
>
>
> > Sort of a similar thing.
> >
> > By turning on TCP header compression you increase the effective
> > utilization of the link by sending more data in less bits.
> >
> > By running proxies on machines with good TCP implementations, satellite
> > (or other very high latency high bandwidth) users can increase the
> > effective utilization of the link by having a larger TCP window to keep
> > the data flowing and correctly tuned retransmission timers to not have
> > unneeded retransmissions only due to the high latency.
> >
> > Then you also have the interesting topic of proxies applying transport
> > transformations of the data. Such as compression. This can even further
> > increase the effective utilization of the link. There is a experimental
> > patch implementing such things in Squid (and yes, HTTP allows for it,
> > and it is even covered by standards)
> >
> >
> > What you need to keep in mind for all those approaches is that there
> > must be a proxy on both sides of the link for most of this, just as
> > there must be support for compressed TCP headers at both sides..
> >
> > --
> > Henrik Nordstrom
> >
> >
> > Awie wrote:
> > >
> > > Wow......I become jealous to hear Audie's download rate. I only use
128
> Kbps
> > > through VSAT that (maximum) run at 10 KB/s to download.
> > >
> > > Henrik, it is interesting to read your email that having proxies can
> > > increase the utilization of the link.
> > >
> > > I configured my router to have TCP Header compression that increase
its
> CPU
> > > 2%-3%. But I can save bandwidth for around 10% - 20%. (Sorry, it
perhaps
> has
> > > no relation with Squid discussion)
> > >
> > > Please advise. Thx
> > >
> > > Best Regards,
> > >
> > > Awie
> > > awie@eksadata.com
> > > PT. EKSADATA INTISOLUSI
> > > Phone : (62-361) 261514
> > > Mobile1 : (62-82) 3610369
> > > Mobile2 : (62-818) 346241
> > > ----- Original Message -----
> > > From: "Henrik Nordstrom" <hno@hem.passagen.se>
> > > To: "Audie Pierre" <audiep@vescomamerica.com>
> > > Cc: <squid-users@ircache.net>
> > > Sent: Tuesday, October 31, 2000 5:38 AM
> > > Subject: Re: [SQU] Performance Question
> > >
> > > > Audie Pierre wrote:
> > > > >
> > > > > Hi! All,
> > > > > If I am downloading @ 80Kb/s without the SQUID proxy server. Does
> > > > > anyone know what the download speed should be approximately with
> SQUID.
> > > > > What is acceptable and what is not?
> > > >
> > > > 80Kb/s. Acceptable variance (except on cache hits) is plus minus a
> > > > non-noticeable fraction. The exception is certain extreme types of
> links
> > > > (i.e. satellites) where having proxies can increase the utilization
of
> > > > the link due to lack of capabilities in most client and server TCP
> > > > implementations and some other odd bieffects..
> > > >
> > > > --
> > > > Henrik Nordstrom
> > > >
> > > > --
> > > > To unsubscribe, see http://www.squid-cache.org/mailing-lists.html
> > > >
> >
>

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