Port overflow error - Исправление ошибок и поиск оптимальных решений проблем

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This section is intended to provide the main information about the wireless unit operation.

The Dashboard displays a read-only summary of the current link status information, local and remote device signal strength, capacity for downlink and uplink, current values of the basic configuration settings and Ethernet network status.

Device status

Parameter	Description
Type	The device type: Master or Slave.
Status	Wireless connection state.
Device uptime	The device operating time since the last reboot.
Firmware version	The firmware version uploaded to the device.

Wired interface

In the «Wired interface» tab, the Ethernet interface status can be monitored, as well as media type, duplex mode and traffic load for reception and transmission. The wired interface statistic is available on the right side, it can be reset by the «Clear counters» button.

Parameter	Description
Runt packets	Packets less than 64 bytes in size
Oversize packets	Packets larger than 9038 bytes
FCS errors	Packets dropped due to checksum mismatch. The possible reasons for the error counter increasement are described in the «Troubleshooting⁣⁣⁣» article
Port overflow errors	Packets dropped due to port buffer overflow

Wireless link status

The “Radio” tab displays the current settings of the wireless connection, as well as the link load in the uplink and downlink directions.

Parameter	Description
Distance	The estimated link length.
Link uptime	The link operating time since the last outage.
Remote unit	The remote device name.
Center frequency	Center frequency value set in the «Radio» section manually or by the automatic frequency selection mechanism.
Channel width	The channel width value set in the «Radio» section.
Traffic	The wireless link capacity and utilization in the uplink and downlink directions.
Frame size	The frame size value set in the «Radio».
DL / UL ratio	The ratio of the downlink traffic to uplink, set in the «Radio» section manually or by a mechanism for automatically determining the optimal ratio.
Tx power	The transmitter power value on the local device determined by the automatic power control mechanism. If the automatic transmit power control tool is disabled, the value set manually by the user will be displayed.
Remote X power	The transmitter power value on the remote device determined by the automatic power control mechanism. If the automatic transmit power control tool is disabled, the value set manually by the user will be displayed.

Availability statistics

The link availability statistics window displays the following information:

The overall wireless link availability since the last device reboot, the number of wireless outages when the connection was unavailable.
Availability statistics for each modulation, for downlink and uplink streams.

Modulation code scheme

Modulation and coding schemes are selected independently for each channel (uplink and downlink). Current modulation for each channel is displayed in the MCS subsection.

Received signal strength indicator

The RSSI indicator displays the received signal level for each channel (uplink and downlink). Available values:

-90…-80 dBm — close to the receiver sensitivity level, only the lowest modulations are available.
-80…-60 dBm — average input range.
-60…-40 dBm — the recommended range for achieving best performance.
>-40 dBm — input signal level is too high.

EVM

Error vector magnitude — indicator of the measured input signal quality, telling how far are the received constellation symbols compared to the ideal symbols of the constellation. The parameter value must be as high as possible in absolute value.

The recommended level should be less than -21 dB.

Retries and Frame loss

Retried and lost packets need also to be tracked. Retries should tend to zero, link with the retries value more than 5% should not be allowed to operation.

NOTE

Downlink — the direction from Master to Slave, Uplink — the direction from Slave to Master. These directions are correct for the whole link and do not depend on the roles of the devices.

Источник

Hello folks,
thank you for your answers. It will follows some other details and questions about the problem reported:

1) To Uday: I already know in other ways the udp port and the application that cause the overflow. The problem is how to solve this behaviour.

2) To Jeff: using ndd on L1000 and HP-UX11, the ndd command doesn’t recognize the parameters udp_xmit_hiwat and udp_recv_hiwat; they aren’t valid parameters!

Valid parameters are only the following:
# ndd -h|grep udp
ip_udp_status — Reports IP level UDP fanout table
udp_def_ttl — Default TTL inserted into IP header
udp_largest_anon_port — Largest anonymous port number to use
udp_status — Get UDP instances information.
udp_do_checksum — Compute UDP datagram checksum
udp_pass_up_icmp — Controls the delivery of ICMP messages to
udp_pass_up_options — Controls the delivery of options to user
udp_smallest_anon_port — Smallest anonymous port number to use
udp_smallest_nonpriv_port — Smallest port number non-privileged processes
udp_wroff_extra — Header space for link layer header

Where did you find the suggested parameters to increase the size of the UDP buffers?
Are there other valid parameters for HP-UX11?

3) To Ron: now I have not the possibility to test the patch.
With reference to NIC information, here is the lanadmin output:

Description = lan0 Hewlett-Packard 10/100 TX Full-Duplex TT = 1500
Type (value) = ethernet-csmacd(6)
MTU Size = 1500
Speed = 100000000
Station Address = 0x306e0664d9
Administration Status (value) = up(1)
Operation Status (value) = up(1)
….
Index = 1
Alignment Errors = 0
FCS Errors = 0
Single Collision Frames = 0
Multiple Collision Frames = 0
Deferred Transmissions = 0
Late Collisions = 0
Excessive Collisions = 0
Internal MAC Transmit Errors = 0
Carrier Sense Errors = 0
Frames Too Long = 0
Internal MAC Receive Errors = 0

The udp packets are sent to a particular address.
I think I will use also a sniffer to continue the analysis of the problem.

4) To Peter: we don’t use nfs.

If you have other suggestions to solve the problem, you are welcome!

Thank you to everyone.
Regards,
Enrico.

Источник

0 / 0 / 0

Регистрация: 26.05.2013

Сообщений: 11

26.05.2013, 17:06. Показов 11086. Ответов 11

Помогите с задачей,выдает ошибку pow overflow error

Миниатюры

__________________
Помощь в написании контрольных, курсовых и дипломных работ, диссертаций здесь

Programming Эксперт 94731 / 64177 / 26122 Регистрация: 12.04.2006 Сообщений: 116,782	26.05.2013, 17:06
11

alsav22

5493 / 4888 / 831

Регистрация: 04.06.2011

Сообщений: 13,587

26.05.2013, 18:09

Попробуйте написать:

C++

1	pow(2.0, i)

Mimulus

0 / 0 / 0

Регистрация: 26.05.2013

Сообщений: 11

26.05.2013, 18:15

[ТС]

Сообщение от alsav22

Попробуйте написать:

C++

1	pow(2.0, i)

не помогло

190 / 160 / 35

Регистрация: 22.05.2013

Сообщений: 455

Записей в блоге: 1

26.05.2013, 20:38

Сообщение от Mimulus

Помогите с задачей,выдает ошибку pow overflow error

Функция pow не может принимать первый аргумент типа int. Должен быть double, float, long double… Если не помог вышеуказанный метод, можно объявить константу типа double, присвоить ей значение 2.0 и передавать в функцию константу вместо явного числа.

0 / 0 / 0

Регистрация: 26.05.2013

Сообщений: 11

26.05.2013, 21:49

[ТС]

Сообщение от Мимино

и это тоже не помогло

5493 / 4888 / 831

Регистрация: 04.06.2011

Сообщений: 13,587

26.05.2013, 21:55

Тут дело не синтаксисе. Код неправильный.
Mimulus, нужно текст кода выкладывать, а не скрины.

Mimulus

0 / 0 / 0

Регистрация: 26.05.2013

Сообщений: 11

26.05.2013, 22:11

[ТС]

C++

# include <iostream.h>
# include <math.h>
float t(float p)
{ return sin(p)/cos(p);
}
void main()
{ float l1,l,p;
  int i;
  const pi=3.14;
  const eps=1E-3;
   p=pi/8;
   l1=pow(t(p),t(2*p));
   i=1;
  do
 { i=i+1;
   l=l1;
   p=p+p/pow(2.0,i);
   l1=pow(t(p),t(2*p));
 }
  while (abs(l1-l)<=eps);
 cout <<"n lim=" << l1;
}

5493 / 4888 / 831

Регистрация: 04.06.2011

Сообщений: 13,587

26.05.2013, 22:26

У меня работает.

Миниатюры

0 / 0 / 0

Регистрация: 26.05.2013

Сообщений: 11

26.05.2013, 22:44

[ТС]

Сообщение от alsav22

У меня работает.

а какая среда?

5493 / 4888 / 831

Регистрация: 04.06.2011

Сообщений: 13,587

26.05.2013, 22:56

Студия.

Добавлено через 9 минут
mingv тоже компилирует, но если заменить abs на fabs.

Belfegor

Ghost

174 / 174 / 40

Регистрация: 16.09.2012

Сообщений: 526

26.05.2013, 22:58

C++

#include <iostream>
#include <cmath>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <string>
#include <cstdlib>
#include <vector>
#include <map>
#include <stack>
#include <set>
#include <list>
#include <iomanip>
#include <functional>
#include <sstream>
#include <fstream>
using namespace std;
#define pow(x,n) pow(1.0*(x),n)
#define ll long long
 
double t(double p) {
    return sin(p) / cos(p);
}
#define EPS            (double)1e-9
#define PI 3.14159265358979
 
inline ll binpow(ll x, ll n) {
    ll res = 1;
    while (n) {
        if (n & 1)res *= x;
        x *= x;
        n >>= 1;
    }
    return res;
}
 
int main() {
    double l1, l, p;
    int i;
    p = PI / 8;
    l1 = pow(t(p), t(2 * p));
    i = 1;
    do {
        i = i + 1;
        l = l1;
        p = p + p / pow(2.0, i);
        l1 = pow(t(p), t(2 * p));
    } while (fabs(l1 - l) <= EPS);
    cout << "lim= " << l1<<endl;
 
    return 0;
}

все ок

Tulosba

4773 / 3267 / 497

Регистрация: 19.02.2013

Сообщений: 9,046

26.05.2013, 23:28

Пределы уже забыл, но код упростил бы хотя бы до такого:

C++

#define _USE_MATH_DEFINES
#include <iostream>
#include <cmath>
 
double f( double p )
{
    return std::pow( std::tan(p), std::tan(2*p) );
}
 
void main()
{ 
    const double eps=1E-3;
    double p= M_PI/8;
    double l1 = f(p);
 
    int i=1;
    double l;
    do
    { 
        l = l1;
        p += p/std::pow(2.,++i);
        l1 = f(p);
    }
    while (std::abs(l1-l)<=eps);
    std::cout <<"n lim=" << l1;
}

Источник

Windows 10: COM Port Overflow

Discus and support COM Port Overflow in Windows 10 Drivers and Hardware to solve the problem; Hi,

I recently came into a curious issue where I apparently exhausted all available COM ports. Now, every time a new device is connected to the…
Discussion in ‘Windows 10 Drivers and Hardware’ started by Chelsey Smith, Jan 15, 2020.

COM Port Overflow

Hi,

I recently came into a curious issue where I apparently exhausted all available COM ports. Now, every time a new device is connected to the machine, COM0 is used. I assume a Y2K like issue arose after it assigned COM4096 and began an overflow to COM0… which apparently does not/should not exist.

Using a utility, I was able to uninstall the phantom devices ranging from ~COM50 through COM4096. However, I was unable to remove the 100+ COM0’s that exist as the utility throws an error.

I then tried manually uninstalling the devices in the Device Manager… it appears to work, but does not remove the device.

Changing the COM port from 0 to any valid number, also does not work. In fact, it crashes the Device Manager…

Anyone help/advice would be appreciated.

Thanks,

Chelsey Smith
USB Port Oddities

Ok, let’s see it with pictures step-by-step. First right-click on the USB device and select Update driver software:

Then select Browse my computer for driver software (LAST option) :

The select Let me pick from a list of device drivers on my computer (LAST option) :

Then select the standard driver from the list and click next:

Click next/OK as required to complete installation. Repeat the steps for all Intel USB devices. Finally click on each USB root device and press DEL to delete it, reply YES when asked. After deleting all USB root devices restart the computer.

I hope this is detailed enough…
Port is being blocked

Hi,

Thank you for writing to Microsoft Community forums.
- Are you aware of any changes that happened on the computer prior to this issue?
Upon researching, this seems like an issue due to the port scan. You may want to try the steps listed below and check if it works.
- Login to your Netgear
  NX6200 Extender GUI.
- Click on Advanced tab and choose
  WAN Setup.
- Check the box for Disable Port Scan and DoS Protection.
- Allow it to update and check if the port is still being blocked.
However, if the issue persists, I suggest you to post your query in the
TechNet Forums, where we have support professionals
equipped with knowledge on port forwarding.

Regards,
COM Port Overflow

sihost.exe BUFFER OVERFLOW

I am having major issues with my sihost.exe process running on my local after upgrading from Windows 8 to Windows 10. After examining the errors on my pc, I see sihost showing BUFFER OVERFLOW result when attempting to RegQueryValue on Cortana values. My
start menu is unresponsive and things such as opening File Explorer are taking an incredibly long time. I haven’t attempted a system restore from safe mode but this is my next step.

Example:

Operation: RegQueryValue

Result: BUFFER OVERFLOW

Path: HKCUSoftwareClassesExtensionsContractIdWindows.BackgroundTasksPackageIdMicrosoft.Windows.Cortana_1.4.8.176_neutral_neutral_cw5n1h2txyewyActivatableClassIdCortanaUI.AppXd4tad4d57t4wtdbnnmb8v2xtzym8c1n8.mcaDescription

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com port overflow

Источник

Device status

Wired interface

Wireless link status

Availability statistics

Modulation code scheme

Received signal strength indicator

EVM

Retries and Frame loss

Windows 10: COM Port Overflow

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