From jure at hehe.si  Sun Feb  1 20:54:45 2015
From: jure at hehe.si (Jure Koren)
Date: Sun, 01 Feb 2015 20:54:45 +0100
Subject: [LUGOS] delayed ACK
In-Reply-To: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
References: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
Message-ID: <3008942.zg87RtpNG6@havelock>

On Saturday 31 of January 2015 23:14:51 Miha Tom?i? wrote:
> Hojla!
> 
> Pa poglejmo ali tega kdo ve :)

A, to je torej neke vrste preizkus :)

> Po dolgem guglanju in brskanju sem ugotovil, da je moj AFP/netatalk server
> po?asen kot svinja zaradi "delayed ACK"[1]. Na strani Netatalk sem na?el
> re?itev za svoj problem [2], ampak ?al je re?itev uporabna za nekaj deset
> (mogo?e 100 :) kernelov nazaj.
> 
> Najbli?je pridejo navodila za RedHat [3], vendar v mojem kernelu 3.17.7
> tega vraga ni :(
> 
> Ima kdo idejo, kako si ga pri?aram v kernel. Po mo?nosti brez
> patch-recompile-debug-debug...

Tega se v vanilla jedrih ne da ?raufat skozi procfs. Redhat/Centos imata nek 
patch, dobi se ga tudi sicer.

Na?eloma deluje tudi na 3.1x jedrih, ampak ?e nekaj ?asa nisem preizku?al.

https://github.com/vrv/linux-microsecondrto/blob/master/tcp-microsecond-rto-2.6.39.patch

lp,

-- 
Jure Koren
Hehe d.o.o.

From miha.tomsic at gmail.com  Sun Feb  1 23:29:27 2015
From: miha.tomsic at gmail.com (=?UTF-8?B?TWloYSBUb23FoWnEjQ==?=)
Date: Sun, 1 Feb 2015 23:29:27 +0100
Subject: [LUGOS] delayed ACK
In-Reply-To: <3008942.zg87RtpNG6@havelock>
References: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
	<3008942.zg87RtpNG6@havelock>
Message-ID: <CANM2cYxObpU6ONboNudKqq8cfLvSPJMdzXH8p4QEf0VpCdztyw@mail.gmail.com>

Hojla!

01. februar 2015 20.54 je oseba Jure Koren <jure at hehe.si> napisala:
> On Saturday 31 of January 2015 23:14:51 Miha Tom?i? wrote:
> A, to je torej neke vrste preizkus :)

Vse je preizkus! None shall pass! :P

> Tega se v vanilla jedrih ne da ?raufat skozi procfs. Redhat/Centos imata
nek
> patch, dobi se ga tudi sicer.

Sem brskal po zadnjem jedru od Centosa, ampak tam nikjer ne vidim podobnega
pe?a :(

> Na?eloma deluje tudi na 3.1x jedrih, ampak ?e nekaj ?asa nisem preizku?al.
>
https://github.com/vrv/linux-microsecondrto/blob/master/tcp-microsecond-rto-2.6.39.patch

Toliko kernelske vode je ?e preteklo, da ga ne znam natakniti na source od
3.18.3. Ja, vmes se ?el na novej?i kernel v upanju, da bo tam kaj bolje
delovalo, ampak ni :(

Sem na?el tudi jaz nek soroden patch, ampak je takisto malo zarjavel in
nekompatibilen z dana?njimi jedri: http://lwn.net/Articles/502585/

Si bom moral vzeti ?as, da se ponovno spomnim, kako se pravilno skompajla
pope?an kernel. V ?asu i386 smo to delali vsak dan, ker ve?krat sploh
prevesti ni uspel ;)

Hvala in sre?no,
Miha
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From miha.tomsic at gmail.com  Tue Feb  3 14:48:07 2015
From: miha.tomsic at gmail.com (=?UTF-8?B?TWloYSBUb23FoWnEjQ==?=)
Date: Tue, 3 Feb 2015 14:48:07 +0100
Subject: [LUGOS] delayed ACK
In-Reply-To: <CANM2cYxObpU6ONboNudKqq8cfLvSPJMdzXH8p4QEf0VpCdztyw@mail.gmail.com>
References: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
	<3008942.zg87RtpNG6@havelock>
	<CANM2cYxObpU6ONboNudKqq8cfLvSPJMdzXH8p4QEf0VpCdztyw@mail.gmail.com>
Message-ID: <CANM2cYzyBY9pZL_WFwFmcutMMtm61cvtDa3-aBKQtvZjv4XeXw@mail.gmail.com>

Hojla!

01. februar 2015 23.29 je oseba Miha Tom?i? <miha.tomsic at gmail.com> napisala:
> Sem na?el tudi jaz nek soroden patch, ampak je takisto malo zarjavel in
> nekompatibilen z dana?njimi jedri: http://lwn.net/Articles/502585/

Tale patch sem na roko nadeval v source linux-3.18.3.

?lo je vse do zadnjega dela patcha, tam pa se mi ustavi:

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index e911e6c..4bd85fd 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -216,7 +216,8 @@ static void tcp_delack_timer(unsigned long data)
  /* Try again later. */
  icsk->icsk_ack.blocked = 1;
  NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_DELAYEDACKLOCKED);
- sk_reset_timer(sk, &icsk->icsk_delack_timer, jiffies + TCP_DELACK_MIN);
+ sk_reset_timer(sk, &icsk->icsk_delack_timer,
+       jiffies + icsk->icsk_ack.tcp_delack_min);
  goto out_unlock;
  }

Problem je v tem, da nimamo pojma kje in kako naj popravim
net/ipv4/tcp_timer.c, ker ni "ni?emur podoben" :P

?e imamo kak?nega kernel hackerja, ga ?aka pivo. Ali ustrezna
kompenzacija, "ki utopi vse skrbi, v potrtih srcih up budi".

Hvala in sre?no,
Miha

From alte at aufbix.org  Tue Feb 17 21:26:08 2015
From: alte at aufbix.org (Janez Trenz)
Date: Tue, 17 Feb 2015 20:26:08 +0000
Subject: [LUGOS] delayed ACK
In-Reply-To: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
References: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
Message-ID: <6477198.InBtg3iFBO@modri.trenz.si>

On Saturday 31 of January 2015 23:14:51 Miha Tom?i? wrote:
> Hojla!
> 
> Pa poglejmo ali tega kdo ve :)
> 
> Po dolgem guglanju in brskanju sem ugotovil, da je moj AFP/netatalk server
> po?asen kot svinja zaradi "delayed ACK"[1]. Na strani Netatalk sem na?el
> re?itev za svoj problem [2], ampak ?al je re?itev uporabna za nekaj deset
> (mogo?e 100 :) kernelov nazaj.
> 
> Najbli?je pridejo navodila za RedHat [3], vendar v mojem kernelu 3.17.7
> tega vraga ni :(
> 
> Ima kdo idejo, kako si ga pri?aram v kernel. Po mo?nosti brez
> patch-recompile-debug-debug...

Raje popravi gnilo jabolko. :) Ne bo treba ni? prevajati Linux jedra.

$ echo "net.inet.tcp.delayed_ack=2" | sudo tee -a /etc/sysctl.conf

-- 
Janez Trenz  AKA  der_Alte                  o      _     _         _
alte at aufbix.org             __o     __o    /\_   _ \\o  (_)\__/o  (_)
RHC{X,I,E,T,{S,V}A}       _`\<,   _`\<,   _>(_) (_)/<_    \_| \   _|/' \/
CL{P,E},MC{SA,TS,{N,}PS} (_)/(_) (_)/(_) (_)        (_)   (_)    (_)'  _\o_


From jure at hehe.si  Tue Feb 17 22:32:58 2015
From: jure at hehe.si (Jure Koren)
Date: Tue, 17 Feb 2015 22:32:58 +0100
Subject: [LUGOS] delayed ACK
In-Reply-To: <6477198.InBtg3iFBO@modri.trenz.si>
References: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
	<6477198.InBtg3iFBO@modri.trenz.si>
Message-ID: <2410589.Ii7jyX85Do@havelock>

On Tuesday 17 of February 2015 20:26:08 Janez Trenz wrote:
> $ echo "net.inet.tcp.delayed_ack=2" | sudo tee -a /etc/sysctl.conf

To poznajo samo nekatera RedHatova jedra.

3.18.6 tega zagotovo ne pozna:

rfi:~ # sysctl -a | grep delayed_ack
rfi:~ # 

lp,

-- 
Jure Koren
Hehe d.o.o.

From alte at aufbix.org  Tue Feb 17 22:52:24 2015
From: alte at aufbix.org (Janez Trenz)
Date: Tue, 17 Feb 2015 21:52:24 +0000
Subject: [LUGOS] delayed ACK
In-Reply-To: <2410589.Ii7jyX85Do@havelock>
References: <CANM2cYxowedbuvQ-HK4Si52PuiR0sG8PzpjxeMru_6Jiwu_Uvw@mail.gmail.com>
	<6477198.InBtg3iFBO@modri.trenz.si> <2410589.Ii7jyX85Do@havelock>
Message-ID: <9498272.iPmTs3QDgy@modri.trenz.si>

On Tuesday 17 of February 2015 22:32:58 Jure Koren wrote:
> On Tuesday 17 of February 2015 20:26:08 Janez Trenz wrote:
> > $ echo "net.inet.tcp.delayed_ack=2" | sudo tee -a /etc/sysctl.conf
> 
> To poznajo samo nekatera RedHatova jedra.
> 
> 3.18.6 tega zagotovo ne pozna:
> 
> rfi:~ # sysctl -a | grep delayed_ack
> rfi:~ #

Ukaz je namenjen jabolku, ne Linuxu. ;-)

-- 
Janez Trenz  AKA  der_Alte                  o      _     _         _
alte at aufbix.org             __o     __o    /\_   _ \\o  (_)\__/o  (_)
RHC{X,I,E,T,{S,V}A}       _`\<,   _`\<,   _>(_) (_)/<_    \_| \   _|/' \/
CL{P,E},MC{SA,TS,{N,}PS} (_)/(_) (_)/(_) (_)        (_)   (_)    (_)'  _\o_