Write on sockets blocking for long periods of time on writes
Here is the scenario where i am seeing writes on TCP sockets getting blocked for long periods of time
Client (curl) is downloading a large file at slow speed, I can reproduce this by using curl --limit-rate 1k option
Server (running on Ubuntu 16.04.5 LTS) does writes on socket in a loop
In tcp-dump traces, I do see that TCP window of client becomes zero and server is sending ~ 1 KB data/ sec
The writes blocks for ~ 60 seconds and then allows writes of abt 60 K in burst and then blocks again for 60+ seconds
Assuming that send buffer is of fixed size, I would have assumed that writes would block for 1 second and allow write of 1k and then again block for 1 secs , i.e. allow write of 1k every second instead of 60+k every 60 seconds in bursts
Does any one know the reasoning on why i am seeing this behavior? I can see this behavior by looking at strace output
networking
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
add a comment |
Here is the scenario where i am seeing writes on TCP sockets getting blocked for long periods of time
Client (curl) is downloading a large file at slow speed, I can reproduce this by using curl --limit-rate 1k option
Server (running on Ubuntu 16.04.5 LTS) does writes on socket in a loop
In tcp-dump traces, I do see that TCP window of client becomes zero and server is sending ~ 1 KB data/ sec
The writes blocks for ~ 60 seconds and then allows writes of abt 60 K in burst and then blocks again for 60+ seconds
Assuming that send buffer is of fixed size, I would have assumed that writes would block for 1 second and allow write of 1k and then again block for 1 secs , i.e. allow write of 1k every second instead of 60+k every 60 seconds in bursts
Does any one know the reasoning on why i am seeing this behavior? I can see this behavior by looking at strace output
networking
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
add a comment |
Here is the scenario where i am seeing writes on TCP sockets getting blocked for long periods of time
Client (curl) is downloading a large file at slow speed, I can reproduce this by using curl --limit-rate 1k option
Server (running on Ubuntu 16.04.5 LTS) does writes on socket in a loop
In tcp-dump traces, I do see that TCP window of client becomes zero and server is sending ~ 1 KB data/ sec
The writes blocks for ~ 60 seconds and then allows writes of abt 60 K in burst and then blocks again for 60+ seconds
Assuming that send buffer is of fixed size, I would have assumed that writes would block for 1 second and allow write of 1k and then again block for 1 secs , i.e. allow write of 1k every second instead of 60+k every 60 seconds in bursts
Does any one know the reasoning on why i am seeing this behavior? I can see this behavior by looking at strace output
networking
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
Here is the scenario where i am seeing writes on TCP sockets getting blocked for long periods of time
Client (curl) is downloading a large file at slow speed, I can reproduce this by using curl --limit-rate 1k option
Server (running on Ubuntu 16.04.5 LTS) does writes on socket in a loop
In tcp-dump traces, I do see that TCP window of client becomes zero and server is sending ~ 1 KB data/ sec
The writes blocks for ~ 60 seconds and then allows writes of abt 60 K in burst and then blocks again for 60+ seconds
Assuming that send buffer is of fixed size, I would have assumed that writes would block for 1 second and allow write of 1k and then again block for 1 secs , i.e. allow write of 1k every second instead of 60+k every 60 seconds in bursts
Does any one know the reasoning on why i am seeing this behavior? I can see this behavior by looking at strace output
networking
networking
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
asked Jan 21 at 18:11
Harish RawatHarish Rawat
11
11
add a comment |
add a comment |
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