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About CTU
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Member since Oct 19, 2021
Oct 22 2021
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Oct 22 2021
9:26 AM
I'll answer my own question with a quick google search ... "For various reasons having to do with the ordering of messages on iperf3's control channel, the server cannot print summary statistics from the client side. This is a known issue (there are various issues in the iperf3 issue tracker around this problem such as #560 and #314). It's not particularly easy to fix because a solution to this problem would involve changing the ordering or semantics of iperf3's control messages which, unfortunately, aren't particularly well documented. We (ESnet) would be happy to entertain possible fixes."
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Oct 22 2021
9:24 AM
I've been responding with the results from the client for these - I've only just looked but this is a bit strange, is this expected on the server-side? (it seems to report correctly on the client side) [ 5] 0.00-10.03 sec 0.00 Bytes 0.00 bits/sec sender [ 5] 0.00-10.03 sec 29.6 MBytes 24.7 Mbits/sec receiver [ 7] 0.00-10.03 sec 0.00 Bytes 0.00 bits/sec sender [ 7] 0.00-10.03 sec 29.3 MBytes 24.5 Mbits/sec receiver [ 9] 0.00-10.03 sec 0.00 Bytes 0.00 bits/sec sender [ 9] 0.00-10.03 sec 29.9 MBytes 25.1 Mbits/sec receiver [SUM] 0.00-10.03 sec 0.00 Bytes 0.00 bits/sec sender [SUM] 0.00-10.03 sec 88.8 MBytes 74.3 Mbits/sec receiver
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Oct 22 2021
9:07 AM
I've treid these two items - I don't know if they are faster or not? iperf3 -c x.x.x.x -P 3 [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.01 sec 28.4 MBytes 23.8 Mbits/sec sender [ 4] 0.00-10.01 sec 28.2 MBytes 23.6 Mbits/sec receiver [ 6] 0.00-10.01 sec 28.4 MBytes 23.8 Mbits/sec sender [ 6] 0.00-10.01 sec 28.2 MBytes 23.6 Mbits/sec receiver [ 8] 0.00-10.01 sec 28.1 MBytes 23.6 Mbits/sec sender [ 8] 0.00-10.01 sec 27.9 MBytes 23.4 Mbits/sec receiver [SUM] 0.00-10.01 sec 84.9 MBytes 71.1 Mbits/sec sender [SUM] 0.00-10.01 sec 84.4 MBytes 70.7 Mbits/sec receiver Or iperf3 -c x.x.x.x -R -w 256M [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 49.0 MBytes 41.1 Mbits/sec sender [ 4] 0.00-10.00 sec 49.0 MBytes 41.1 Mbits/sec receiver
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Oct 20 2021
2:15 AM
Netsh Output : Name : WiFi Description : Qualcomm QCA61x4A 802.11ac Wireless Adapter GUID : Physical address : State : connected SSID : BSSID : Network type : Infrastructure Radio type : 802.11ac Authentication : WPA2-Personal Cipher : CCMP Connection mode : Profile Channel : 100 Receive rate (Mbps) : 173.3 Transmit rate (Mbps) : 173.3 Signal : 98% Profile : BandChannelModeMax bitrate 5 GHz 100 (20 MHz wide) 802.11ac [ ID] Interval Transfer Bandwidth [ 4] 0.00-1.00 sec 5.12 MBytes 42.8 Mbits/sec [ 4] 1.00-2.01 sec 5.00 MBytes 41.9 Mbits/sec [ 4] 2.01-3.01 sec 5.38 MBytes 45.0 Mbits/sec [ 4] 3.01-4.00 sec 4.88 MBytes 41.1 Mbits/sec [ 4] 4.00-5.01 sec 4.38 MBytes 36.3 Mbits/sec [ 4] 5.01-6.00 sec 4.88 MBytes 41.4 Mbits/sec [ 4] 6.00-7.00 sec 5.12 MBytes 43.1 Mbits/sec [ 4] 7.00-8.01 sec 5.50 MBytes 45.9 Mbits/sec [ 4] 8.01-9.00 sec 6.25 MBytes 52.5 Mbits/sec [ 4] 9.00-10.01 sec 6.25 MBytes 52.3 Mbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.01 sec 52.8 MBytes 44.2 Mbits/sec sender [ 4] 0.00-10.01 sec 52.6 MBytes 44.1 Mbits/sec receiver iperf Done.
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Oct 20 2021
12:18 AM
I'm not on that site at present, and I didn't record details of the wifi connection. This is the same laptop at a different site (connecting to older equipment - the comparison isn't exactly the same) which is what I would more expect to get. ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 70.6 MBytes 59.2 Mbits/sec sender [ 4] 0.00-10.00 sec 70.5 MBytes 59.1 Mbits/sec receiver
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Oct 19 2021
8:23 AM
Hi Rob Good to know that you go this sorted out, even if you don't know why/what the problem might have been. I don't see the red cross between the devices as you did. Craig.
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Oct 19 2021
8:15 AM
Hi, I've put some comaprisons together - Server Internal Copy, Server to Server over LAN, Laptop to Server over LAN, and finally Laptop to Server over Wifi. WFWIL-CLHV02 (server) 1) File transfer speed (Hard Drive copy) 1.3GB sec WFWIL-CLHV02 to WFWIL-CLHV03 (Server to Server) (On core stack 1) (Both servers with 2 x 40Gb links, LACP across 2 x switches in 3 switch stack) 1) File Transfer Speed 500MB a sec 2) iperf 3 Transfer 0.00-10.00 sec 4.62 GBytes 3.97 Gbits/sec sender [ 4] 0.00-10.00 sec 4.62 GBytes 3.97 Gbits/sec receiver BKCCTU to WFWIL-CLHV03 (laptop to server via LAN) (1Gb Cat6e to Core stack 2 ( 2 x 10Gb) to Coretsack 1) 1) File Transfer speed 90MB a sec (should we expect higher, I think on a 1Gb link this is about right) 2) iperf 3 [ 4] 0.00-10.00 sec 708 MBytes 594 Mbits/sec sender [ 4] 0.00-10.00 sec 708 MBytes 594 Mbits/sec receiver BKCCTU to WFWIL-CLHV03 - (laptop to server via Wifi, only device connected to AP) (Meraki MR36 to CoreStack 2 (2 x 10Gb) to Core Stack 1) 1) File Transfer 5.76 MB sec 2) [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.01 sec 41.2 MBytes 34.6 Mbits/sec sender [ 4] 0.00-10.01 sec 41.1 MBytes 34.5 Mbits/sec receiver
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Oct 19 2021
3:13 AM
"test Failed" is happening on Switches, + other WAPs. This I think is a recent issue, as we've had slow access since July (we investigated many other things before the Wifi as we assumed the issue was server-related -a the one thing we've never had issues with is Meraki Wi-Fi!). The link is set as : Link negotiation Auto negotiate (1 Gbps)
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Oct 19 2021
2:53 AM
ap.meraki.com - usually gives 25-30. (I've replaced a Rukus system that was quite old, which didn't seem to have these issues - it may be that these issues were there but we just blamed it on "old & poor wifi")
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Oct 19 2021
2:43 AM
I've tried SSIDs in bridge & not bridge mode. Iperf3 has been used, but I didn't record specific data 1) Client 1 on Wifi AP1, Clien2 on Wifi AP1 (eg both connected to the same WAP) = Good Speeds (eg 30Mb +) 2) Different Aps (so WAP1 > LAN > WAP2) slow speeds (8Mb at most) 3) Wifi to LAN = Slow speeds (8Mb at most) General "internet" speeds are good, but it may be that the slower internet is expected by users (eg Teams works fine on wireless)
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Oct 19 2021
2:29 AM
> Have you updated the WiFi driver on your machines? Wifi drivers are as up to date as can be - either manufacturer (usually dell) or via direct downloads from driver websites (eg intel). The same Laptops do not have the same issues at other sites. > Are you using 5Ghz (I would disable 2.4Ghz altogether)? Some devices need a further range of 2.4ghz - we have tried Per SSID 2.4 o 5 config (to see if it one or the other). Band steering is off on all SSIDs. > Is your AP deployment dense? If so, use 20Mhz for your channel width. Channel width is set to 20 > Have you increased the minimum bit rate to 12Mb/s for the SSID (or WiFi in general)? Minimum Bitrate is 12 - 54 (802.11b is not supported)
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Oct 19 2021
2:17 AM
powercfg /SETDCVALUEINDEX SCHEME_CURRENT 19cbb8fa-5279-450e-9fac-8a3d5fedd0c1 12bbebe6-58d6-4636-95bb-3217ef867c1a 0
powercfg /SETACVALUEINDEX SCHEME_CURRENT 19cbb8fa-5279-450e-9fac-8a3d5fedd0c1 12bbebe6-58d6-4636-95bb-3217ef867c1a 0 I have tried this, and this has no effect. My Laptop (that I have tried this on) works fine at other sites.
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Oct 19 2021
2:00 AM
Hi I have a current setup that includes MS425 (stacks), M225 (stacks) and MR36 WAPs, as well as a Windows Cluster, Windows Server, and standalone servers. Connections between servers are either LACP/Team (2 x 10Gb), or individual RJ45 (1 x 1GB). Stacks are done via stacking cables, with LACP links to other stacks (eg 3 x 10Gb copper SFP connections) When on RJ45 connected LAN, we have good performance, but as soon as we go wireless, we are getting very poor transfer speeds (this is particularly noticeable on file access to windows servers, but does seem to affect other things - eg Group policy, DNS, Pings - one thing we don't get complaints over is internet speed). As an example, transferring a 300Gb file from LAN -> Wifi, will give us a transfer rate of 2/3 Mb a sec. Transfering the same file, from LAN to LAN will get us 100Mb+ speeds.This is similar when using Client > LAN > Virtual Server, Client > LAN >Clustered Physical Server (LACP), Client > LAN > Stand alone server (Single Connection). If I do two file transfers from Wifi -> Wifi on the same AP (for example a laptop to laptop) then it's around 30Mb a sec (which is what I would expect). As soon as the Laptops are on different APs (even though connected to the same switch) then the rate falls to 2/3Mb a sec. I've turned off meshing, I've had Meraki look at config (and recommended a firmware update as well as increasing the base speed to ignore wireless B), I've created Access policies with unrestricted (instead of normal), Fixed IP addresses, access via IP rather than DNS names. Basically, it's quicker to download a file from SharePoint, than it is to access a local server and download the same file.
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Oct 19 2021
1:35 AM
Apologies for bringing this message up from the dead - I wondered if you ever had this resolved, as I'm getting a similar issue with Wifi <-> LAN traffic.
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