On 2009-Jun-22 13:12:08 +0200, Wojciech Puchar woj...@wojtek.tensor.gdynia.pl
wrote:
i know all this, but i'm asking why processing single interrupt takes
4 CPU cycles.
All I can suggest is that you browse the sources and see what the
rl(4) interrupt handler does. If you want to dig
i have pentium 200 with that card. doing ftp from other machine, getting
3.5MB/s (HDD can 10MB/s, DMA) having 45%-55% interrupt load.
I had the same probelm. I rebuilt the kernel with the POLLING option
set to ON and turned on polling for all network interfaces. It helped
much :)
Best regards,
But - this computer can do memcpy at 80MB/s, so at 3.5MB/s it should be 5%
CPU for memcpy, and one interrupt per one packet (2500 packets/s).
Is something more that make it consume 50% CPU?
Accessing the on-card memory through PCI is guaranteed to be
slower than the main memory, and depending
Why it's THAT bad?
Because CPU always have to copy frames to/from the controller.
comment says card do DMA. just then it has to copy but within main memory
not PCI.
These CPU cycles could have been used in other task to give more
performance such as SSH encryption/decryption, checksum
i have pentium 200 with that card. doing ftp from other machine, getting
3.5MB/s (HDD can 10MB/s, DMA) having 45%-55% interrupt load.
when sending it's not that bad.
tried writing file to disk with cat /dev/zero file, it's only 3% ints
with 10MB/s traffic.
Why it's THAT bad?
3.5MB/s is
Wojciech Puchar woj...@wojtek.tensor.gdynia.pl writes:
Why it's THAT bad?
http://svn.freebsd.org/base/head/sys/pci/if_rl.c
Scroll down past the copyright, license and attribution. Read the
38-line comment that explains just how crappy this chip really is.
Executive summary: every single
Wojciech Puchar woj...@wojtek.tensor.gdynia.pl writes:
Why it's THAT bad?
http://svn.freebsd.org/base/head/sys/pci/if_rl.c
Scroll down past the copyright, license and attribution. Read the
38-line comment that explains just how crappy this chip really is.
Well - really low end.
But - this
On Sun, Jun 21, 2009 at 05:14:29PM +0200, Wojciech Puchar wrote:
i have pentium 200 with that card. doing ftp from other machine, getting
3.5MB/s (HDD can 10MB/s, DMA) having 45%-55% interrupt load.
when sending it's not that bad.
tried writing file to disk with cat /dev/zero file, it's
Wojciech Puchar wrote:
Wojciech Puchar woj...@wojtek.tensor.gdynia.pl writes:
Why it's THAT bad?
http://svn.freebsd.org/base/head/sys/pci/if_rl.c
Scroll down past the copyright, license and attribution. Read the
38-line comment that explains just how crappy this chip really is.
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