quite easy: write the error in google and walla:
snip from a thread:
Whew. I found the reason for the problem. Apache is running as
group www and the group file had two groups www with different
numerical ids. Must have some historical reason that we use a
differing numerical id on a few
On 7 August 2005, the Tel Aviv Linux Club will meet again to hear Ori Idan's
presentation about building and maintaining the Linux kernel. The time of day
is 18:30 and the place is Schreiber building, room 007 of Tel Aviv
University.
More information can be found at the club's site:
Hi,
For the upcoming August Penguin Hacking Contest (APCHII) we need 6 computer
monitors. If you have a computer monitor (17 is preferred) that you can
bring with you to the contest (if it's not clear - the monitor will be
returned to you afterwards...) please let me know.
All monitor
Is there a mailing list (other than this list) to post questions about
performance tuning of sendmail? Alternatively, is there anyone out
there who has significant experience with performance tuning of
Sendmail (preferrably on Debian) who might be interested in a few
hours of consulting work?
Hi list
We have some driver that performs
zero-copy DMA to userspace allocated
buffers. The problem is that the device
cannot perform DMA to RAM pages
with physical addresses above 4G ( this
is heavily memory equipped computer)
My question is it somehow possible to
restrict memory mapping for
On Sun, Jul 31, 2005 at 02:08:06PM +0300, Boris Zingerman wrote:
We have some driver that performs
zero-copy DMA to userspace allocated
buffers. The problem is that the device
cannot perform DMA to RAM pages
with physical addresses above 4G ( this
is heavily memory equipped computer)
My
Gilboa Davara wrote:
Muli,
I well aware of the controversy surrounding FS access from kernel
modules and I accept, that in general, kernel modules should be using
the FS for storage.
However, in essence, I'm using the *wrong* tool for the right job: I
shouldn't be using Linux on a i386/x86-64
Boris Zingerman wrote:
We have some driver that performs
zero-copy DMA to userspace allocated
buffers. The problem is that the device
cannot perform DMA to RAM pages
with physical addresses above 4G ( this
is heavily memory equipped computer)
My question is it somehow possible to
restrict
Umm...
Let me try and further explain what I need.
I'm writing a certain software network filter that handles -certain-
Ethernet and ATM/POS traffic.
Due to obvious performance consideration (Especially when under ATM) the
filter runs in kernel space, start to finish.
After the traffic is
Gilboa Davara wrote:
Umm...
As far as I can see, realyfs uses memory buffer for storage, which is
major no-no in my case:
At 50-200MB/sec I'll deplete the system RAM within minutes (even on
AMD64) and as far as I can see, there's no obvious way to commit the
buffers into static storage.
Current
Gilad Ben-Yossef wrote:
So long as you didn't perform 2, you want the information to wait in a
temporary buffer (I first wrote bugger here, which is rather funny ;-)
A Freudian slip is when you mean one thing but say your mother.
Now you can write that Temporary buffer layer in kernel that
Gilad,
Umm... Interesting. You might be right... but I'm still not convinced.
(Though my project manager will love the general idea. To say the least,
she doesn't really fancy the idea of writing our own FS :))
I'm sorry if I seound harsh, but I don't think you udnerstand your own
needs.
It
On Sun, Jul 31, 2005 at 04:53:21PM +0300, Shachar Shemesh wrote:
The RelayFS page talks about why they are not the same as netlink, but
they don't actually say what the difference is, or why they think it is
better. I'd love to hear why you recommend one but not the other - what
are the
Muli Ben-Yehuda wrote:
On Sun, Jul 31, 2005 at 04:53:21PM +0300, Shachar Shemesh wrote:
The RelayFS page talks about why they are not the same as netlink, but
they don't actually say what the difference is, or why they think it is
better. I'd love to hear why you recommend one but not the
Gilboa Davara wrote:
Let's try to analyze them together - you need to store large amount of
data from the network for proccessing by a further entity. What that
data is exactly doesn't matter, but we will note that you might need to
do non trivial handling of the data (encryption).
I
On Sun, Jul 31, 2005 at 05:31:11PM +0300, Shachar Shemesh wrote:
and a device+ioctl?
deprecated, except in very specific case (only one I can recall in
recent memory is the Cell's SPE interface, and that one is not yet
decided).
/sys?
Setting and reading device configuration and attributes.
On Sunday 31 July 2005 11:20, Michael Ben-Nes wrote:
Whew. I found the reason for the problem. Apache is running as
group www and the group file had two groups www with different
numerical ids. Must have some historical reason that we use a
differing numerical id on a few machines. One of the
Quoting Larry Weisberg, from the post of Sun, 31 Jul:
Is there a mailing list (other than this list) to post questions about
performance tuning of sendmail? Alternatively, is there anyone out
I'd google for it, and try sendmail.org actually...
there who has significant experience with
Hi,
NAPI (New API) is a technique to improve network performance on Linux.
It is not so new (relatively) - first howto is from 16/2/2002.
In a really very brief descriptiom , it uses polling intsead of
interrupts in some scenarios.
This polling is done for receiving packets (the network card
Gilboa Davara wrote:
Here's how I see it:
Kernel 1:
Device - SKB - Reassembly - Disk.
(I can even save the third memcpy [Reassembly - Disk] I go rewrite the
world under me)
User:
Device - SKB - Reassembly ( - ?) Relayfs - User: write(2) -
Kernel: sys_write (copy_from_user) - Disk.
On Sun, 2005-07-31 at 17:35 +0300, Gilad Ben-Yossef wrote:
I should add the encryption optional, depending on load and source. (And
more important, how fanatical is the client)
(There's no way in hell, I'll be able to process and encrypt two OC48
links in real time...)
I believe
On Sun, 31 Jul 2005, Gilboa Davara wrote:
On Sun, 2005-07-31 at 17:35 +0300, Gilad Ben-Yossef wrote:
Interesting... that might work.
Let me first point out that once the cells/frames have been processed, I
don't care much for timing. (Which bodes well on your solution).
However,
Hello,
Running badblocks -n on my hard drive I found a couple hundred
of bad blocks, apparently pretty well concentrated in two areas.
I intend to buy a new drive but still trying to make use of this 80Gb
Maxtor drive I googled for low level format (the type that asks the
drive itself to map bad
On 8/1/05, Gilboa Davara [EMAIL PROTECTED] wrote:
To be honest, I don't worry much about encryption. I doubt that it'll be
used in any real high-bandwidth case. It will be used in cases where
security matters most and bandwidth is *very* low to begin with.
Use an encrypted filesystem?
And as
On 8/1/05, Rami Rosen [EMAIL PROTECTED] wrote:
Polling is usually discouraged in linux device drivers , but there are
cases (like when the interrupt rate is very high) in which this
technique can improve
performance.
I'm just intrigued by this - how feasable would it be to write a driver
(and
On 8/1/05, Shlomo Solomon [EMAIL PROTECTED] wrote:
That doesn't seem to be the problem:
I though you settled on the decision that the problem is the
size of the file - could you justtry to create a file of just a little
less than 2Gb size and fetch it, then icrease the same file to
just a little
On Monday 01 August 2005 06:30, Amos Shapira wrote:
I'm just intrigued by this - how feasable would it be to write a driver
(and have support in the device hardware) that uses interrupts but
switches to NAPI when the input rate peaks, then switches back to
interrupts when the rate drops again?
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