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Questions tagged [buffer]

The tag has no usage guidance.

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0answers
18 views

Encapsulate udp traffic info tcp with on-disk buffering

My ipfix flow receiver supports only udp (can't be replaced), which is not resistant to network failures and then I'm loosing flow data. To improve this I'm thinking about using socat, mkfifo between ...
0
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0answers
5 views

-/+ buffers/cache getting increased [duplicate]

I have a Linux system in which I am running some load . After 24 hrs of load I can see that there is an increase in the -/+ buffers/cache of 180 MB. -/+ buffers/cache: 3540 12410 Will it be the ...
3
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2answers
156 views

What scale of data loss or corruption do I risk if I enable the write buffer on a file server?

I have found plenty of articles online warning of risk of data loss or corruption for drives with write-buffer enabled in the event of power loss. However, I haven't found any that actually refer to ...
1
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1answer
627 views

System network buffers leaking/fully used, on Windows x64 with plenty of free RAM. How to diagnose and resolve?

This is related to this question and extends it. The symptoms are the same - 2012R2 x64 with 64GB RAM (21GB used), ping and nslookup both work fine, but IE won't open web pages, net use X: \\share ...
0
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1answer
66 views

How does buffering work in a chain of Asterisk servers?

I have two Asterisk servers in a chain like this: SIP client (G.729) <-SIP-> Asterisk 1 (converting G.729 to G.711) <-IAX2-> Asterisk 2 -> terminated to analog line. When no buffering was ...
0
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2answers
87 views

RAM usage is high altough there is no high usage from proccesses?

Our virtual server has Centos 6 OS. When I look to buffer/cache usage it seems less at first line. Proccesses're not use to memory highly. Do u have any idea about this situation? Can it be about ...
1
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1answer
8k views

How to check buffer pool size in sql server?

Is there any way to find total allocated buffer pool size in sql server.In mysql we can find it by using the variable innodb_buffer_pool_size.Is there any equivalent for that in sql server?
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0answers
248 views

correlation of buffer, cache and “buffer cache”

I understand that a buffer is a location in RAM which is used by the kernel in order to cope with I/O operation between devices that operate at different speeds. Specifically, for the kernel, each ...
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0answers
52 views

No buffer available on Debian-Machine

I'm running a LAMP-Stack on a debian machine for a while now. I configured it the way I'm used to, which never produced weird network or memory issues. On random days at random time I'm getting a ...
-2
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2answers
877 views

Use SSD to buffer a storage Hard Drive [closed]

I have a specific storage server plan in mind. I want to use a SSD to buffer all data that I want written to a hard drive. The data would be written to the SSD, but copied to the HDD aswell. Kinda ...
0
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1answer
361 views

Does httpd ProxyPass buffer http POST payload before sending it to backend server?

I'm looking to assert whether, in the case of httpd used as a reverse proxy (mod_proxy_http & ProxyPass) and with a POST request (not chunked), if httpd buffers (memory and/or disk) complete ...
0
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1answer
360 views

Set large buffer/queue on a network interface to emulate bufferbloat

I want to emulate large buffer delay on a specific interface. I have a simple dumbbell topology like: PC1 eth0 <-----------------------> eth0 PC2 It would be good if I ping PC1 from PC2, ...
3
votes
2answers
392 views

Node.js program failing to read .log text file with Buffer error

I am attempting to view a log with a program called 'logger'. When I run node logger I get the following error: <Buffer 66 72 75 69 74 69 73 68 79 0a> The 'logger' program file looks as ...
13
votes
1answer
11k views

Nginx: How To Completely Disable Request Body Buffering

I'm trying to set up Madsonic on my Ubuntu box and have Nginx run in front of it. Problem is, I keep getting this warning when I try to upload stuff through the web interface: 31115#0: *14 a client ...
1
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0answers
97 views

Ping buffer size and time to respond on Windows HP Blade

I can see different time to respond when using large ping buffer size for one of our HP Blade servers. When using default buffer size, time to respond is the same on all servers. As a first step to ...
1
vote
2answers
5k views

Mysql innodb_buffer_pool_size in relation to innodb_buffer_pool_instances

I run a virtual server with an Owncloud installation on it. Now Owncloud has the problem that the way it's developed at the moment, each file upload causes a little MySql overhead. So is very ...
0
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1answer
292 views

Reduce TCP send buffer

I have a windows 2008 R2 server, an app is constantly polling another server (using a Flash Socket) while waiting for a certain event to occur on that server. We are talking about milliseconds. When ...
1
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0answers
755 views

nginx proxy_buffering and send response to client immediately

To break the question down to one sentence: Is it Possible to turn on proxy_buffering in nginx, but sending the response of the backend server immediately to the client when the client is fast enough ...
2
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0answers
2k views

OpenVPN sndbuf and rcvbuf

I would like to know what is the difference between the sndbuf and rcvbuf buffer used by OpenVPN and net.core.w/rmem_default or net.ipv4.tcp_r/wmem. What does OpenVPN do when some value a provided ...
0
votes
1answer
5k views

What do “key buffer size” and “total MyISAM indexes” unit sizes mean?

I ran MySQLTuner on my database to check if things are working correctly and optimally, but I was confused as to the units used for these two values. Here is what the output looks like for ...
0
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0answers
110 views

MySQL read-buffer-size overflow

What will happen if a low value was assigned in my.cnf to any of the per-thread buffers, when it fills? I'm thinking of possible scenarios: MySQL will gracefully call realloc for additional block ...
0
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1answer
631 views

Bitnami apache + php-fpm stack can't disable buffer

I'm trying to get my service running that requires it output without a buffer. Is it possible to use php-fpm without a buffer with apache? <IfDefine USE_PHP_FPM> <Proxy "unix:/opt/...
5
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1answer
2k views

Linux: What application is using my ram cache

I am wondering if I can see which application is using my ram buffer and cache. Also is there any time specified in kernel, when data is dropped from cache. My Ram is being full used by buffer and ...
0
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1answer
90 views

linux pseudo files for rotating streams

i've got some problem with rotating files. Situation is next: one program like wireshark or vlc dumps all to one file, say netstream.bin If i mv netstream.bin to netstream.bin.rotate program will ...
0
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1answer
286 views

Set MySQL innodb buffer pool size on IIS7

I am using VPS, Windows 2008 r2, IIS7, MYSQL 5.1.73, Hardward Config: Ram 2GB , Hardisk 40GB On this VPS only 1 .NET application is running. Application is currently using by only 5 users. I found ...
3
votes
1answer
10k views

ESXi 5 Hypervisor fatal boot error

For over 2 years now I've been running ESXi 5 just fine from a pen drive. I recently had to move the server to a new location and started seeing an issue. Once the system starts to boot, I get: '...
4
votes
1answer
2k views

Is there a way to get current txqueue utilization on e.g. eth0 or tun device?

I have detected drops on my tun0 interface. They seem to have been caused by low txqueuelen setting. Now as I increased the txqueuelen value for the network device and there are no more drops yet - ...
5
votes
2answers
19k views

“No buffer space available” on connect

I'm seeing the error message "No buffer space available" when processes call "connect" on a Linux virtual machine. I'm having trouble tracking down the cause - hopefully someone can help! I've ...
51
votes
2answers
85k views

an upstream response is buffered to a temporary file

I have a rather large and slow (complex data, complex frontend) web application build in RoR and served by Puma with nginx as reverse proxy. Looking at the nginx error log, I see quite a few entries ...
2
votes
2answers
715 views

Network Buffer Usage

I am facing some issues with my Application, and am curious to know the network buffer usage at any given moment. I am using a CentOS 6 linux Machine. I know the Default values are present in /proc/...
9
votes
2answers
20k views

How to share the clipboard between Windows Server 2008R2 and a guest running Ubuntu 12.04? [closed]

I use Windows Server 2008 R2 with Hyper-V and a guest running Ubuntu 12.04 LTS. How can I share the clipboard between Windows Server 2008R2 and a guest running Ubuntu 12.04? UPDATE What protocols ...
1
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1answer
5k views

Cisco Port Buffer Memory

How can the total amount of port buffer memory be determined for Cisco switches? Cisco doesn't seem to publish this data anywhere as part of the hardware specifications, but the information seems ...
0
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1answer
919 views

Mass memory used, buffer free, no apps started

Have searched for many times before asking for my problem. I've 6gb RAM, 4 currently used, 2 free, buffers are low # free -m total used free shared buffers cached ...
7
votes
2answers
8k views

Netstat -s showing (and growing) “packets pruned from receive queue” and “packets collapsed in receive queue”

we are seeing the following: [root@primary data]# netstat -s | grep buffer ; sleep 10 ; netstat -s | grep buffer 20560 packets pruned from receive queue because of socket buffer overrun ...
2
votes
1answer
3k views

Mysql crashing due to InnoDB not able to allocate memory

MySQL crashes every now and then due to, I believe, a large request hitting it above the innodb-buffer-pool-size set in my.cnf (currently at 210M), which I needed to set for mysql to start in the ...
2
votes
1answer
7k views

security_error_ring_buffer_recorded in system health log - what does it mean?

Our company is running a few servers for a couple of websites. The server are running Windows Server 2012 and for databases we have MS SQL Server 2012. Today I was checking the log files located in: ...
0
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2answers
554 views

MySQL: Increased buffer pool, ibdata1 corrupt?

I tried increasing innodb_buffer_pool_size via my.cnf from default 128m to 256m, but on restart attempt, mysql shutdown failed with: 130125 11:49:55 InnoDB: Initializing buffer pool, size = 256.0M ...
2
votes
1answer
749 views

Linux buffer memory always stays at zero

One of my hosted server is a Xen guest running Debian and linux kernel 2.6.32 then 2.6.38. It has been running fine for quite some time (more than a year) but I recently noticed something weird. For ...
3
votes
1answer
2k views

Nginx + MP4 module: buffer limits are being ignored

I have an nginx/1.2.3 server compiled with --with-http_mp4_module as a pseudostreaming server. Streaming and seeking works fine except buffering. Tt seems like the buffer directives are being ...
4
votes
1answer
4k views

How can I force a merge of all WAL files in pg_xlog back into my base “data” directory?

Question: Is there a way to tell Postgres (9.2) to "merge all WAL files in pg_xlog back into the non-WAL data files, and then delete all WAL files successfully merged?" I would like to be able to "...
-2
votes
1answer
218 views

Packet Buffer size in D-link DES-3552

What is the Packet Buffer size in D-link DES-3552? I haven't found this information on any site (including official).
0
votes
1answer
5k views

Choosing a buffer size for large file transfer - SSH

I am trying to transfer large files over an internal network using Secure Shell SSH Client (3.2.9). The default buffer size is 32KB, which should be plenty, but my specific case makes me wonder if I ...
2
votes
0answers
201 views

Tcp window size won't go above 130048

I have 2 servers set up with about 80ms latency between them. Both are centos 6 and run a java app that transfers data from on location to another. Both are on 1gbps connections. I have been trying ...
7
votes
5answers
39k views

join_buffer_size >= 4 M is not advised?

I get this message from MysqlTunner.pl: join_buffer_size >= 4 M This is not advised On the other hand, I read in Debian's my.cnf guide about jont_buffer_size that: This buffer is used for the ...
1
vote
2answers
2k views

nginx configuring uwsgi and gzip buffers for different usage scenarios

I'm trying to configure two URL path groups for relatively different usage scenarios and resource consumption in nginx. Both are served by same uwsgi application. Group 1: Regular HTML pages up to ...
2
votes
2answers
4k views

Nginx : Mp4 videos not seeking and starting immediately

I learned how to compile nginx with mp4 module. I also added proper directive in my website conf. I am trying to play a mp4 using JW player and flow player. But the video doesn't buffer and play like ...
0
votes
1answer
900 views

Is there a system wide limit to the total amount of socket & queue buffer space?

in Linux I know that you can tweak the maximum buffer size per socket connection, but is there a system wide limit to the amount of space the buffers can take up and does this apply equally to the ...
2
votes
1answer
577 views

Solaris/UNIX: Does snoop have the potential to slow down network traffic?

This is the way I see it. A copy of the network activity is written to a buffer, and snoop reads from the buffer. As long as snoop is able to get the data out fast enough (writing directly to a file ...
-3
votes
1answer
330 views

Disk buffer: why does it even exist in many disk controllers? [closed]

When you request disk for data, it usually first gets transferred to the disk buffer in the disk controller, and then it gets sent up to RAM (and thus stored in memory). I was just wondering what the ...
7
votes
2answers
2k views

Linux disable disk cache for a single command

Our server is performing decently, but when backups or other scan processes run it will tank the entire server. Something like clamd will run and scan many files. While we expect slow performance, it'...