ecifically to avoid
this cpu hopping behavior.
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bscribing too. I've removed them both. Blacklisting
the miralink.com domain doesn't seem to be stopping the
subscriptions so I need to delve further where those are
coming from.
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David S. Miller
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if there are some real
implementation issues compared to running without the zerocopy
patch applied.
This is not to say that the x86 memcpy performance thing is being
ignored, Linus and others are working on what to do about that
seperately.
Please test, thanks.
Later,
David S
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dd yet another member to the SKB structure.
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+ ((MTU + PAGE_SIZE - 1) / PAGE_SIZE)" buffers
per packet when going over a zerocopy device using TCP.
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.
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Michael H. Warfield writes:
> On Fri, Feb 02, 2001 at 03:36:46PM -0800, David S. Miller wrote:
> So block them using the /etc/mail/access database for sendmail
> and do it with a "451" error code. The data will back up on their
> mail server and start clogging
bout it.
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der pages to satisfy allocations of linear SKB data
buffers.
This has consequences and benefits system wide.
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PU utilization resulting from
zerocopy sendfile leaves more CPU available for CGI execution.
This was a point I forgot to make.
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Ple
d for?
It helps no matter what part of the file the client reads.
sendfile() can be used on an arbitrary offset+len portion of
a file, it is not limited to just sending an entire fire.
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ywhere else.
I've removed the meltingpot address from linux-kernel.
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Prasanna P Subash writes:
> I looked at the skb_recv_datagram code and noticed that wait_for_packet is not
> returning an error, even while trying to read a closed socket.
> Anyways here is a patch against 2.4.1 that will fix the issue.
> Please feel free to flame me about the patch :)
Pleas
s at best.
I actually went to the FreeBSD code because what Steven's showed
was extremely loose in what it let through. It allowed the nfs
port override trick Alan mentioned.
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start keeping a real ChangeLog.zerocopy file going at the
same place you get the patches from.
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CP one, which instead
uses UDP and let me know what FreeBSD and Solaris do in that case.
Of course, skip the listen part.
I think the test for port reuse in tcp_{v4,v6}_get_port is buggy.
I'll go study this and fix it up... but please do the test I asked
anyways.
Later,
David S. Mill
[EMAIL PROTECTED] writes:
> Yep... Damn, specially split errno and ready values and forgot to use
> this. 8) Sorry.
Patch applied.
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Malcolm Beattie writes:
> Alexey has mailed me suggesting the problem may be that netfilter
> is turned on.
Oh yes, netfilter being enabled will cause some performance
degradation, that is for sure.
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n Athlon-950 system. If anyone else sees this or
can try it out themselves, please let me and the list know.
There is a workaround, after bootup, pull the mouse out then plug it
back in. Wheee... this seems to work until I figure out what really
is causing the problems.
Later,
David S. Mille
Malcolm Beattie writes:
> David S. Miller writes:
> >
> > At the usual place:
> >
> > ftp://ftp.kernel.org/pub/linux/kernel/people/davem/zerocopy-2.4.1-1.diff.gz
>
> Hmm, disappointing results here; maybe I've missed something.
As discussed elsew
Rusty Russell writes:
> Oops. Thanks to Anton for testing and touching up this patch.
>
> The 2.0/2.2 setsockopt code used to do the copy_from_user for you...
I've applied this to my tree, thanks a lot.
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han this, I don't know what to postulate. Really,
most reports and my own experimentation (directly connected
Linux knfsd to 2.4.x nfs client) supports the fact that our
client can saturate 100baseT rather fully.
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the bulk of the cpu cycle savings will occur.
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he netapp, and if so how many switches
sit between you and this netapp?
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data receive path in the client, CPU has to
be saved compared to pre-zerocopy or something is very wrong.
File copy speed, well you should be link speed limited as even without
the zerocopy patches you ought to have enough cpu to keep it busy.
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Chris Wedgwood writes:
> On Tue, Jan 30, 2001 at 01:33:34AM -0800, David S. Miller wrote:
>
> 2) Accept TCP flags (ACK, URG, RST, etc.) for out of window packets
>if truncating the data to the window would make that packet valid.
>(Alexey)
&
if truncating the data to the window would make that packet valid.
(Alexey)
3) Add SO_ACCEPTCONN, Unix standard wants it. (me)
Have fun testing...
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(atomic_t), sizeof(unsigned long)).
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to do with who owns
Hotmail. Please, let's keep this element out of the
dialogue until we have a reason to be suspicious.
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rmware distribution issue is worked out, so please get it
resolved for me as I want to include your work, ok?
Thanks.
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Please read
lly, please do some tests on loopback. It is usually a great
way to get "pure software overhead" measurements of our TCP stack.
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David S. Miller
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[EMAIL PROTECTED] writes:
> Dave, seems, it is better to repair this. Code really assumes
> that SG cannot be used without one of CSUM flags...
SG+CSUM requirement is enforced now in my tree, I will publish a newer
zerocopy patch later today.
Later,
David S. Miller
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worthless
if most TCP implementations cannot transfer data from it. It would
be far nicer to have all of the black holes fixed rather than fixing
all of the TCP implementations."
Golden words :-).
*/
Later,
David S. Miller
[EMAIL PROTE
u actually list a directory or something and make
sure my workstation made a new connection _back_ to you?
If you are using passive FTP and/or did not do a directory
listing, you did the test incorrectly. The directory listing
is what will test the ECN'ness of your local firewall.
Later,
Da
Rogier Wolff writes:
> Am I missing something?
...
> 17:05:59.961324 server.http > client.1880: . 1:1(0) ack 287912 win 0
> (DF)
server advertises zero window, no data may be sent.
Until server advertises a non-zero window, the data transfer
may not proceed.
Later,
David S. M
WAN.
The endpoint based congestion notification happens _now_ if both
sides speak ECN. The router based notification will be happening
in the near future as Cisco and others deploy ECN speaking versions of
their router software.
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David S. Miller
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Aarnio earlier today on this list for the
reasons why.
People must fix their firewalls, there is no other way to
fix the problem and get ECN properly deployed. I'm ceasing
conversation on this thread from this point forward.
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ot;retry" the connection, or anything else like that. It
means connection failed, and we must return error from connect().
Nothing else is acceptable.
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The connection failed, RST means connection reset. RST means all
state is corrupt and this connection must die. It cannot be
interpreted in any other way.
Using it as a metric for ECN enabling is thus unacceptable.
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one].status2);
or at the very least make it print out netdev->name instead of the
cryptic "sf: " prefix.
Finally, what are the listed distribution terms of this firmware?
I want to make sure it is legal to distribute it.
Deal with these three issues, and I'll stick this into m
g valid TCP RST frames is unacceptable and
Linux will not do that as long as I am maintaining it.
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n -1;
Anton, why are you always returning -1 (which means error for the
smb_message[] array functions) when using sendfile?
Aren't you supposed to return the number of bytes output or
something like this?
I'm probably missing something subtle here, so just let me
know what I missed.
Tha
Chris Wedgwood writes:
> On Thu, Jan 25, 2001 at 10:34:47AM -0800, David S. Miller wrote:
>
> That's it, in 4 weeks time I am putting a kernel onto
> vger.kernel.org that speaks ECN. This is my official and only
> warning.
>
> Why wait 4 weeks a
ther schemes
so far have been met with reluctance on the part of these sites.
I do not want to condone mechanisms which allow people to make
crutches for these broken sites ad infinitum.
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things in the future,
things we haven't thought of now, so don't interpret these bits so we
can do that and you will still work".
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.
As far as I understand it, the PIIX stuff doesn't run IOS but rather
some other system created for these firewall products.
Moot point. I understand that upgrading can be a pain, but I think
it is in their best interest to do so (see better internet and "make
money" argum
lation
of the "be liberal of what you receive" mantra of the internet
standards committee which the hotmail person quoted seemed so
keen on mentioning :-)
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fferent machines, such as INKY.SOLINUS.COM which seems
to let ECN connections through just fine.
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ion is pizda.ninka.net, please everyone be nice.
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he mac level checksum will detect all errors and does
> not have a checksum of its own on data, so it would only need SG to benefit
> from the zerocopy framework,
Which is just fine.
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y patch I end up
sending to Linus.
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x27;t Fragment" bit set in the IP header, which as
a consequence means the ID field is meaningless.
If the "don't fragment" bit were not set, and fragmentation was
possible, Linux will use a randomized ID field. The nessus folks
need to fix their test.
Later,
David S. Miller
[EMAI
d note: what's involved in making a driver
> zerocopy-aware? I haven't looked too closely to the current patch,
When you look closely at the current patch, you will see exactly what
is required. 3 hardware drivers are ported there, and are to be used
as examples.
Later,
David S. Miller
[
oss. I cannot see it
being argued that these entities have not been given enough notice
of the problem. If they cannot be bothered to get fixed an issue like
this after nearly half a year, I cannot be bothered to feel bad for
them when all users at their site lose access to the lists.
Later,
D
is my official and only warning.
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James H. Cloos Jr. writes:
> What exaclty were the issues with the intel cards and sg+csum?
>
> Any idea how much work it'd require to surmount them?
Getting Intel to release full specs on how to make use of
TX hardware checksum assist with the eepro100.
Later,
David S.
Tigran Aivazian writes:
> On Thu, 25 Jan 2001, David S. Miller wrote:
> > 3) NFS client side activity
>
> this bit interesting (to me). Do you mean Linux NFS client as present in
> the Linux kernel source (nfs filesystem) or just the type of traffic
> generated by
sendfile())
3) NFS client side activity
on both cards supporting sg+csum and those which do not.
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nding upon architecture.
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yte.
Callers of tcp_sequence check the return value bits accordingly.
This is all slow path code, so there are no performance issues.
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David S. Miller
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communicate with half of the systems out there.
BSD and Solaris both make these kinds of packets, therefore it is must
to handle them properly. So we will fix Linux, there is no argument.
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David S. Miller
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just protect with #ifdef MAX_SKB_FRAGS or similar. See?
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packets.
I'd really like Cisco to reaffirm this and furthermore, and
furthermore get in contact with and correct the hotmail folks
if necessary.
I have in fact noticed that some sites that did have the problem have
installed the fix and are now accessible with ECN enabled.
Later,
David S. Mill
, this is a show-stopper bug in the zerocopy patches and
must be fixed.
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David S. Miller
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up in 2.4.1-pre10) which means it likely
won't be fixed until Linus takes those quota code changes.
Please stick to 2.4.1-preX on sparc64, and if using 2.4.1-pre10 please
apply this patch to get a clean build :-)
Later,
David S. Miller
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--- ./arch/sparc/kernel/signal.c.~1~
Marcelo Tosatti writes:
>
> While taking a look at page_launder()...
...
> set_page_dirty() may lock the pagecache_lock which means potential
> deadlock since we have the pagemap_lru_lock locked.
Indeed, the following should work as a fix:
--- mm/vmscan.c.~1~ Thu Jan 11 02:22:19 200
Petru Paler writes:
> Got more "udp v4 hw csum failure" messages but still no "UDP packet
> with bad csum was fragmented".
OK, last experiment :-) Add this patch, and watch to see if
the UDP "InErrors" field in /proc/net/snmp has a non-zero value after
letting it run for a while. Thanks.
--
tring errors don't belong in kernel space IMHO.
Thus the smiley in my original email. I did not mean kernel errno
strings to be taken seriously at all.
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Andi Kleen writes:
> David's /proc/errno_strings
David put a smiley at the end of that sentence, he was kidding and was
trying to show you how rediculious keeping errno strings in the kernel
is.
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ia this, and makes no attempt to understand what the different return
values mean.
People must be really suffering right now, and we ought to get
/proc/errno_strings implemented as soon as possible... :-)
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er belong in the kernel.
Put it in glibc or wherever.
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Petru Paler writes:
> > Oh, I think I know why this happens. Can you add this patch, and next
> > time the UDP bad csum message appears, tell me if it says "UDP packet
> > with bad csum was fragmented." in the next line of your syslog
> > messages? Thanks.
>
> Sure, but I also need the a
h, I think I know why this happens. Can you add this patch, and next
time the UDP bad csum message appears, tell me if it says "UDP packet
with bad csum was fragmented." in the next line of your syslog
messages? Thanks.
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David S. Miller
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ed errors which are perfect for this
purpose.
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back to "1" in include/net/tcp.h
This is just an increased debugging setting compared to Linus's
tree, the message you see is harmless.
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>
> Am I doing something else wrong ?
If the quota interfaces have changed, then all of the translation code
support for them in sys_sparc32.c/systbls.S/etc. need to change to
accomodate.
Stick with non-AC kernels for no on sparc64, thanks. (But feel free to
use the zerocopy patches :-)
Later,
octl or socket option change, and making a
call for a feature I haven't configured into my kernel?
I think ENOSYS is just a bad a choice.
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IP_ADVANCED_ROUTER=y
Try CONFIG_IP_MULTIPLE_TABLES.
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Please read the FAQ at http://www.tux.org/lkml/
xprt_sock_lock in this
section of code, not just one or just the other.
Linus, please do not apply this patch until these issues
are addressed.
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Petru Paler writes:
> - struct dqblk d;
> + struct dqblk32 d;
What does this fix? Things compile just fine without
it and looking at the code it was intended to be of
the original type.
Please explain exactly what submitted patches fix in
the future, thanks.
Later,
D
this is that khttpd is unmaintained garbage.
TUX is evidence that khttpd can be done properly and
beat the pants off of anything done in userspace.
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ith in the
Linux kernel, and sleeping SMP mutex locks lead to exactly this kind
of problem.
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Date: Thu, 11 Jan 2001 10:45:13 -0600 (CST)
From: Paul Cassella <[EMAIL PROTECTED]>
I'm not familiar enough with the tcp code to know if this patch
(against -ac6) is a solution, band-aid, or, in fact, wrong, but
I've run with it (on -ac3) and haven't seen the errors for over
twe
the TIME_WAIT socket
reaper. The fix is simple, just duplicate the tcp_tw_count
decrement into the "if (max_killed)" code block.
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u32 packet classifier algorithm halt if all handles
are taken already. From me.
8) Fix SMP protection of xprt->snd_task value, from me.
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Date: Thu, 11 Jan 2001 11:41:30 +0100 (CET)
From: Ingo Molnar <[EMAIL PROTECTED]>
On Tue, 9 Jan 2001, David S. Miller wrote:
> I'm actually considering making the SG w/o hwcsum situation illegal.
i believe it might still make some limited sense for normal sendmsg()
From: Rusty Russell <[EMAIL PROTECTED]>
Date: Thu, 11 Jan 2001 12:38:26 +1100
My bad. Please revert, and apply this (the samba.org guys are now the
same form as the others):
Done.
Later,
David S. Miller
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Date:Thu, 11 Jan 2001 11:35:30 +
From: Darryl Miles <[EMAIL PROTECTED]>
Identical filenames, nothing bad appears to be happening it just
looks weird.
Known problem, here is the fix:
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore
vanilla/linux/net/sysc
ernel stack, which is indicative of a sparc64 specific bug I only
fixed very late in the 2.2.18 patches.
Later,
David S. Miller
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his achievement was worthless :-)
There are a few approaches that work, but they tend to take up too
much space to be considerable, as Linus mentioned.
Later,
David S. Miller
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27;.
The compiler does this for you, check the assembler it outputs.
Later,
David S. Miller
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Date:Tue, 9 Jan 2001 09:38:53 -0800
From: David Rees <[EMAIL PROTECTED]>
The link to http://www.samba.org/netfilter/iptables-1.1.1.tar.bz2 is
invalid in 2.4.0, this patch simply removes the link.
Thanks, I've applied this.
Later,
David S. Miller
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Thanks for the fix.
Later,
David S. Miller
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s left out of my patches.
I measures smp_call_function on my Dual Pentium 350, and it took
around 1950 cpu ticks.
And this is one of several reasons why the MSG_NOCOPY facility is
considered experimental.
Later,
David S. Miller
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in the NFS client with
the zerocopy patches applied.
Later,
David S. Miller
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Date: Tue, 9 Jan 2001 18:56:33 -0800 (PST)
From: dean gaudet <[EMAIL PROTECTED]>
is NFS receive single copy today?
With the zerocopy patches, NFS client receive is "single cpu copy" if
that's what you mean.
Later,
David S. Miller
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this is a horrible scheme quality of implementation wise.
Later,
David S. Miller
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serspace pages, so if you write to them before
the data is fully sent and the networking buffer freed, they get
copied with a COW fault.
Later,
David S. Miller
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