Kernelnewbies Digest, Vol 48, Issue 10

Mon Nov 10 08:54:59 EST 2014

How to get access to mainn kenel code repository through git as I need to
add some patches for reviews.Where can i get the bramch to submit my code
for review.

Bhagaban

On Mon, Nov 10, 2014 at 7:24 PM, mohanty bhagaban <bhagaban181 at gmail.com>
wrote:

> Hi ,
>
> How to get access to min kenel git as i need to add some patches for
> reviews.
>
> Bhagaban
>
> On Sat, Nov 8, 2014 at 10:30 PM, <kernelnewbies-request at kernelnewbies.org>
> wrote:
>
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>> When replying, please edit your Subject line so it is more specific
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>> Today's Topics:
>>
>>    1. Re: Eudyptula challenge status (Drew Fustini)
>>    2. RE: lots of connections in SYN_RECV state (Puneet Agarwal)
>>    3. Re: lots of connections in SYN_RECV state
>>       (Valdis.Kletnieks at vt.edu)
>>    4. Re: lots of connections in SYN_RECV state (Dave Tian)
>>    5. RE: lots of connections in SYN_RECV state (Puneet Agarwal)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 7 Nov 2014 11:04:28 -0600
>> From: Drew Fustini <pdp7pdp7 at gmail.com>
>> Subject: Re: Eudyptula challenge status
>> To: Dan <qsdconsulting at gmail.com>
>> Cc: kernelnewbies <kernelnewbies at kernelnewbies.org>
>> Message-ID:
>>         <
>> CAEf4M_B6W3GJ8P_ShhpoL8QqtGEZ7h18p92BxuH0foQOQYj2Wg at mail.gmail.com>
>> Content-Type: text/plain; charset=UTF-8
>>
>> Yup, I submitted my current task 4 weeks ago, sent  a note last week,
>> and got reply the next day (Nov 1) with same sentiment: relax -
>> everything is ok, it's a slow process, and it's not a race.
>>
>> On Tue, Nov 4, 2014 at 8:59 PM, Dan <qsdconsulting at gmail.com> wrote:
>> > Ramon Fried <ramon.fried <at> tandemg.com> writes:
>> >
>> >>
>> >>
>> >> Hey all.
>> >> Tasks are pending for a long time. Anyone has Info regarding the queue?
>> >> Thanks.
>> >> Ramon
>> >>
>> >>
>> >> _______________________________________________
>> >> Kernelnewbies mailing list
>> >> Kernelnewbies <at> kernelnewbies.org
>> >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>> >>
>> >
>> >
>> > I've been on challenge 5 for about a month and a half. I sent him a
>> follow
>> > up email a few weeks ago and he replied "Relax, things are slow,
>> there's no
>> > rush..."
>> >
>> > His response times before that were usually less than 2 days.
>> >
>> >
>> >
>> > _______________________________________________
>> > Kernelnewbies mailing list
>> > Kernelnewbies at kernelnewbies.org
>> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Fri, 7 Nov 2014 23:11:26 +0530
>> From: Puneet Agarwal <puneet.agr at outlook.com>
>> Subject: RE: lots of connections in SYN_RECV state
>> To: Dave Tian <dave.jing.tian at gmail.com>, Silvan Jegen
>>         <me at sillymon.ch>
>> Cc: "kernelnewbies at kernelnewbies.org"
>>         <kernelnewbies at kernelnewbies.org>
>> Message-ID: <SNT153-W7011B59E54B5FD99A3604699850 at phx.gbl>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> I use linux kernel 2.6. I have enabled SYN cookies already. But that does
>> not seem to solve the problem. Overall request latency is very high with
>> these many half open connections.
>>
>> Thanks and Regards
>> Puneet
>> ----------------------------------------
>> > Subject: Re: lots of connections in SYN_RECV state
>> > From: dave.jing.tian at gmail.com
>> > Date: Fri, 7 Nov 2014 23:49:35 +0800
>> > CC: puneet.agr at outlook.com; kernelnewbies at kernelnewbies.org
>> > To: me at sillymon.ch
>> >
>> > Latest kernel provides a TCP SYN Cookie feature to defense from SYN
>> flooding.
>> >
>> > -daveti
>> >
>> >
>> >> On Nov 6, 2014, at 11:58 PM, Silvan Jegen <me at sillymon.ch> wrote:
>> >>
>> >> 2014-11-06 16:15,Puneet Agarwal:
>> >>> Is there a way to check the reason, why they do not answer to the
>> >>> SYN-ACK's?
>> >>
>> >> I don't think so. After all, they just don't answer and they won't tell
>> >> you why (AFAIK there is no way to ask them why either)...
>> >>
>> >> You could try to check for patterns in the incoming IP addresses to see
>> >> from how many different places these connections are being made. I
>> think
>> >> that way it should be possible to figure out from which geographic
>> >> location these problematic connections are coming from as well. What
>> you
>> >> would do with these findings I am not sure though.
>> >>
>> >> If these connection negatively impact the performance of your servers
>> >> you should definitely look into to countermeasures mentioned in the RFC
>> >> here.
>> >>
>> >> http://tools.ietf.org/html/rfc4987
>> >>
>> >>
>> >> _______________________________________________
>> >> Kernelnewbies mailing list
>> >> Kernelnewbies at kernelnewbies.org
>> >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>> >
>>
>>
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Fri, 07 Nov 2014 13:10:05 -0500
>> From: Valdis.Kletnieks at vt.edu
>> Subject: Re: lots of connections in SYN_RECV state
>> To: Puneet Agarwal <puneet.agr at outlook.com>
>> Cc: Dave Tian <dave.jing.tian at gmail.com>, Silvan Jegen
>>         <me at sillymon.ch>,       "kernelnewbies at kernelnewbies.org"
>>         <kernelnewbies at kernelnewbies.org>
>> Message-ID: <9736.1415383805 at turing-police.cc.vt.edu>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> On Fri, 07 Nov 2014 23:11:26 +0530, Puneet Agarwal said:
>>
>> > I use linux kernel 2.6. I have enabled SYN cookies already. But that
>> does not
>> > seem to solve the problem. Overall request latency is very high with
>> these many
>> > half open connections.
>>
>> So, out of curiosity, where are all these half open connections coming
>> from?  Are they from addresses in your local network?  Outside sites that
>> *should* be connecting?  Places you've never heard and and probably
>> *shouldn't*
>> be connecting?
>>
>> (Also, if you have properly implemented syncookies, you shouldn't *have*
>> any
>> half-open connections.  That's the whole point of syncookies....)
>>
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>> ------------------------------
>>
>> Message: 4
>> Date: Sat, 8 Nov 2014 07:48:14 +0800
>> From: Dave Tian <dave.jing.tian at gmail.com>
>> Subject: Re: lots of connections in SYN_RECV state
>> To: Valdis.Kletnieks at vt.edu
>> Cc: Puneet Agarwal <puneet.agr at outlook.com>, Silvan Jegen
>>         <me at sillymon.ch>,       kernelnewbies at kernelnewbies.org
>> Message-ID: <3C9C05E5-9B76-4C85-ABB5-D6A9D345E871 at gmail.com>
>> Content-Type: text/plain; charset=utf-8
>>
>> Oops, my bad. I remember seeing sth on LWN for the 3.x kernel talking
>> about a new feature related with TCP SYN. Thought this pretty old stuff was
>> the one?
>>
>> -daveti
>>
>>
>> > On Nov 8, 2014, at 12:58 AM, Valdis.Kletnieks at vt.edu wrote:
>> >
>> > On Fri, 07 Nov 2014 23:49:35 +0800, Dave Tian said:
>> >> Latest kernel provides a TCP SYN Cookie feature to defense from SYN
>> flooding.
>> >
>> > If by "latest" you mean "since Andi Kleen submitted a patch for 2.1.44",
>> > back in July 1997....
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 5
>> Date: Sat, 8 Nov 2014 07:35:30 +0530
>> From: Puneet Agarwal <puneet.agr at outlook.com>
>> Subject: RE: lots of connections in SYN_RECV state
>> To: "Valdis.Kletnieks at vt.edu" <valdis.kletnieks at vt.edu>
>> Cc: Dave Tian <dave.jing.tian at gmail.com>, Silvan Jegen
>>         <me at sillymon.ch>,       "kernelnewbies at kernelnewbies.org"
>>         <kernelnewbies at kernelnewbies.org>
>> Message-ID: <SNT153-W6599D6BF8CD3550AB9FB9899820 at phx.gbl>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> These connections are from outside the network, and the IP's are
>> legitimate ones which should be connecting.
>> I don't know whether the IP's which I could see are the real ones or
>> spoofed ones.
>>
>> sysctl -a says
>> net.ipv4.tcp_syncookies = 1
>>
>> cat /proc/sys/net/ipv4/tcp_syncookies also gives 1
>>
>> Isn't this sufficient to enable syncookies?
>>
>> Thanks and Regards
>> Puneet
>> ----------------------------------------
>> > To: puneet.agr at outlook.com
>> > CC: dave.jing.tian at gmail.com; me at sillymon.ch;
>> kernelnewbies at kernelnewbies.org
>> > Subject: Re: lots of connections in SYN_RECV state
>> > From: Valdis.Kletnieks at vt.edu
>> > Date: Fri, 7 Nov 2014 13:10:05 -0500
>> >
>> > On Fri, 07 Nov 2014 23:11:26 +0530, Puneet Agarwal said:
>> >
>> >> I use linux kernel 2.6. I have enabled SYN cookies already. But that
>> does not
>> >> seem to solve the problem. Overall request latency is very high with
>> these many
>> >> half open connections.
>> >
>> > So, out of curiosity, where are all these half open connections coming
>> > from? Are they from addresses in your local network? Outside sites that
>> > *should* be connecting? Places you've never heard and and probably
>> *shouldn't*
>> > be connecting?
>> >
>> > (Also, if you have properly implemented syncookies, you shouldn't
>> *have* any
>> > half-open connections. That's the whole point of syncookies....)
>> >
>>
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>>
>> End of Kernelnewbies Digest, Vol 48, Issue 10
>> *********************************************
>>
>
>
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