Date: Thu, 15 Sep 2005 10:36:18 -0700 From: David Kirchner <dpk@dpk.net> To: Alex Prokhorenko <freebsd-list@prokhorenko.net> Cc: freebsd-stable@freebsd.org Subject: Re: em0: data transfer Message-ID: <35c231bf050915103611be6ca3@mail.gmail.com> In-Reply-To: <20050915091256.GA28523@radiocom.net.ua> References: <20050915091256.GA28523@radiocom.net.ua>
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On 9/15/05, Alex Prokhorenko <freebsd-list@prokhorenko.net> wrote: > Hello, >=20 > We have the following network card em0: <Intel(R) PRO/1000 Network > Connection, Version - 1.7.35> being controlled by 5.4-STABLE/SMP. > The problem that we face lies in low data transfer speed from server > to network. The card is connected to 100Mbps port of the switch > (setting speed/duplex or autoselect option does not have any influence > on the results). If there is a file downloaded via FTP from the server > the speed is hardly higher than 4MBps. However, there is a flaw: if we > launch trafshow -npi em0 outgoing transfer speed will immediately rise > up to 12MBps, if we stop trafshow we get the low speed problem again: 4MB= ps. > Please, help us locate the reason of such a low data transfer speed. I can't state for a fact this is the problem, but I've found that disabling ACPI in the kernel (and of course as a module) increases transfer rates significantly.
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