Hello
U can download coreutils from gnu.org.
Sent from my HTC
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Message: 1
Date: Thu, 21 Jun 2012 18:17:36 +0800
From: ?? lovelyl...@gmail.com
Subject: Re: [RFC] tcp: How does SACK or FACK determine the time to
start fast retransmition?
To: Vijay Subramanian subramanian.vi...@gmail.com
Cc: netdev net...@vger.kernel.org, kernelnewbies@kernelnewbies.org
Message-ID: 4fe2f4c0.4020...@gmail.com
Content-Type: text/plain; charset=UTF-8; format=flowed
? 2012/6/21 16:42, Vijay Subramanian ??:
With SACK, number of dupacks does not have much meaning. What matters is
--how the SACK scoreboard looks like i.e. which packets are tagged
Lost/Sacked/Retransmitted
-- Whether FACK is in use (this assumes holes in between sacked
packets are lost and have left the network and so we can send out more
packets)
So, stack does not count the number of dupacks that have come in. Only
SACK blocks matter.
You can try to track the following path:
tcp_ack() deals with incoming acks and if it sees a dupack (does not
matter what number), or incoming packet contains SACK it calls
tcp_fastretrans_alert() which calls tcp_xmit_retransmit_queue().
tcp_xmit_retransmit_queue() decides which packets to retransmit. The
first packet to start retransmitting from is tracked in
tp-retransmit_skb_hint.
Note that the dupThresh is actually tracked by tp-reordering which
measures the reordering in the network and is not fixed at 3. So, if
more than
tp-reordering packets have been acked above a given packet, this
packet is a candidate for retransmisson. See tcp_mark_head_lost() to
see how the
reordering metric is used to mark packets as lost. This corresponds to
the check you mentioned in the RFC.
So, window permitting, packets are sent as follows;
(a)-- Packets marked lost as per description above
(b)-- new packets (if any)
(c)-- Holes between sacked packets which are not reliably lost.
choice between (b) and (c) is made in tcp_can_forward_retransmit().
Hope this helps.
Vijay
It is just I wanted! Thanks for your detailed explaination and kindness.
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Message: 2
Date: Thu, 21 Jun 2012 17:57:22 +0530
From: Vijay Chauhan kernel.vi...@gmail.com
Subject: Kernel Memory
To: kernelnewbies@kernelnewbies.org
Message-ID:
CAJ61zBA++CFmTHSb2cRr=ckjdtkvyssvs3_igesbbf21gwa...@mail.gmail.com
Content-Type: text/plain; charset=ISO-8859-1
Hello,
I am newbie.
It has been said kernel memory is not pageable
What does it mean? There is no concept of kernel virtual address?
Any simple explanation will help me to udnerstand.
Thanks,
Vijay
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Message: 3
Date: Thu, 21 Jun 2012 20:48:48 +0800
From: ?? wangzhe5...@gmail.com
Subject: download the source code of some commands
To: kernelnewbies kernelnewbies@kernelnewbies.org
Message-ID:
cajrru3vhh719vzgccj3r8k842yemeo9d5_0swgqsgdnxe0v...@mail.gmail.com
Content-Type: text/plain; charset=iso-8859-1
Hi all:
I want to see some source code of some commands,for
example,halt,reboot,uptime,and so on.
but i don't kown where to download? can you give me some advice?
Thanks in advance!
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Message: 4
Date: Thu, 21 Jun 2012 05:53:00 -0700
From: ashish_bun...@dell.com
Subject: RE: download the source code of some commands
To: wangzhe5...@gmail.com, kernelnewbies@kernelnewbies.org
Message-ID:
a1a98fd909dc5248811a65c5d18e9c7635de8be...@blrx7mcdc202.amer.dell.com
Content-Type: text/plain; charset=iso-2022-jp
All commands are bin files. You should find the scripts for them in /usr/bin
only.
Ashish Bunkar
Linux Engineering
Dell | BDC
office +91-80-28078131, mobile +91-7259183696
ashish_bun...@dell.commailto:narayana...@dell.com
From: kernelnewbies-boun...@kernelnewbies.org
[mailto:kernelnewbies-boun...@kernelnewbies.org] On Behalf Of ??
Sent: Thursday, June 21, 2012 6:19 PM
To: kernelnewbies
Subject: download the source code of some commands
Hi all:
I want to see some source code of some commands,for
example,halt,reboot,uptime,and so on.
but i don't kown where to download? can you give me some advice?
Thanks in advance!
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