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Jean-Paul
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Joined: 13 Apr 2009
Posts: 269

PostPosted: Sun Oct 26, 2014 10:40 am    Post subject: new kernels, slow wifi Reply with quote

I have a strange behave with new kernels and wifi-speed - new kernels means >=3.16.0.

I load down the portage-tree from this server
grep 'GENTOO_MIRRORS' /etc/portage/make.conf wrote:
GENTOO_MIRRORS="ftp://mirror.netcologne.de/gentoo/"

Normaly I download with about 6.5MB/s.
New kernel reduce the speed to 350KB/s.

I change nothing else but the kernel !!

Quote:

emerge-websync
--2014-10-26 10:39:30-- ftp://mirror.netcologne.de/gentoo//snapshots/portage-latest.tar.bz2
=> »-«
Auflösen des Hostnamen »mirror.netcologne.de«... 194.8.197.22
Verbindungsaufbau zu mirror.netcologne.de|194.8.197.22|:21... verbunden.
Anmelden als anonymous ... Angemeldet!
==> SYST ... fertig. ==> PWD ... fertig.
==> TYPE I ... fertig. ==> CWD (1) /gentoo//snapshots ... fertig.
==> SIZE portage-latest.tar.bz2 ... 71103434
==> PASV ... fertig. ==> RETR portage-latest.tar.bz2 ... fertig.
Länge: 71103434 (68M) (unmaßgeblich)

10% [===> ] 7.674.400 348KB/s ETA 2m 7s ^C


dmesg | grep -e "iwl\|cfg"
[ 3.120957] cfg80211: Calling CRDA to update world regulatory domain
[ 3.120962] cfg80211: Calling CRDA to update world regulatory domain
[ 3.122985] iwlwifi 0000:03:00.0: irq 48 for MSI/MSI-X
[ 3.124956] iwlwifi 0000:03:00.0: loaded firmware version 25.222.9.0 op_mode iwlmvm
[ 3.132332] iwlwifi 0000:03:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
[ 3.132380] iwlwifi 0000:03:00.0: L1 Disabled; Enabling L0S
[ 3.132612] iwlwifi 0000:03:00.0: L1 Disabled; Enabling L0S
[ 3.140241] cfg80211: World regulatory domain updated:
[ 3.140243] cfg80211: DFS Master region: unset
[ 3.140244] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 3.140246] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 3.140247] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 3.140248] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 3.140249] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 3.140250] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 3.140257] cfg80211: Calling CRDA for country: DE
[ 3.142717] cfg80211: Regulatory domain changed to country: DE
[ 3.142719] cfg80211: DFS Master region: unset
[ 3.142720] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 3.142722] cfg80211: (2400000 KHz - 2483500 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[ 3.142723] cfg80211: (5150000 KHz - 5250000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[ 3.142725] cfg80211: (5250000 KHz - 5350000 KHz @ 40000 KHz), (N/A, 2000 mBm), (0 s)
[ 3.142726] cfg80211: (5470000 KHz - 5725000 KHz @ 40000 KHz), (N/A, 2698 mBm), (0 s)
[ 3.142727] cfg80211: (57240000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
[ 3.337523] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[ 5.632591] iwlwifi 0000:03:00.0: L1 Disabled; Enabling L0S
[ 5.632819] iwlwifi 0000:03:00.0: L1 Disabled; Enabling L0S


lsmod | grep -e "iwl\|cfg"
iwlmvm 125276 0
led_class 3115 1 iwlmvm
mac80211 283674 1 iwlmvm
iwlwifi 72641 1 iwlmvm
cfg80211 211360 3 iwlwifi,mac80211,iwlmvm
rfkill 14814 2 cfg80211


egrep -v '^[[:space:]]*$|^[[:space:]]*#' /etc/local.d/country.start
iw reg set DE


egrep -v '^[[:space:]]*$|^[[:space:]]*#' /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=8
11n_disable=1 reduce the speed to 30KB/s


zgrep "IWL\|CFG" /proc/config.gz
CONFIG_CFG80211=m
# CONFIG_CFG80211_DEVELOPER_WARNINGS is not set
# CONFIG_CFG80211_REG_DEBUG is not set
CONFIG_CFG80211_DEFAULT_PS=y
# CONFIG_CFG80211_INTERNAL_REGDB is not set
CONFIG_CFG80211_WEXT=y
CONFIG_IWLWIFI=m
CONFIG_IWLWIFI_LEDS=y
# CONFIG_IWLDVM is not set
CONFIG_IWLMVM=m
CONFIG_IWLWIFI_OPMODE_MODULAR=y
# CONFIG_IWLWIFI_BCAST_FILTERING is not set
# CONFIG_IWLWIFI_DEBUG is not set
# CONFIG_IWL4965 is not set
# CONFIG_IWL3945 is not set


So what should I look at first?
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lagalopex
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Joined: 16 Oct 2004
Posts: 544

PostPosted: Sun Oct 26, 2014 10:59 am    Post subject: Reply with quote

If you boot an older kernel the speed is restored to 6.5MB/s? Any differences in logs etc?
The newest stable kernel still has this issue?

You should then also check the vanilla sources (look for one good and one bad). If the problem persists bisecting the kernel would help.
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Jean-Paul
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Joined: 13 Apr 2009
Posts: 269

PostPosted: Sun Oct 26, 2014 11:22 am    Post subject: Reply with quote

Thanks for youre answer.

Yes, 3.14.14-gentoo raised up the speed to 6.5MB/s.
All other newer kernel - I have tested 3.16.5-gentoo, 3.17.1-gentoo, 3.16.6-vanilla - reduce the speed to ~350KB/s.

Unfortunately there is nothing in the logs.
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