Socket transfer speed

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I have made a simple Server/Client file transfer,
The Uploader has a 1MB/s upload bandwidth and downloader 12MB/s download bandwith.

Yet the max transfer speed is around 200kB/s, so a 5th of it's potential.
Is there anything that can be done to increase it's performance?

//File path in string file
FileInfo fi = new FileInfo(file);

int len = 0;
int rdby = 0;

FileStream fin = new FileStream(file, FileMode.Open, FileAccess.Read);
NetworkStream nfs = new NetworkStream(p);

//Send Header
byte[] tmp = new byte[9];
//File length
BitConverter.GetBytes(fi.Length).CopyTo(tmp, 1);
//Command byte
tmp[0] = (byte)Cmd.download;
nfs.Write(tmp, 0, tmp.Length);

//Send File, pSize = 1024
tmp = new byte[pSize];
while (rdby < fi.Length && nfs.CanWrite)
{
    len = fin.Read(tmp, 0, tmp.Length);
    nfs.Write(tmp, 0, len);
    rdby = rdby + len;
}
fin.Close();

Thanks for reading.

Posted 19-Dec-11 6:24am

Scalee

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Sergey Alexandrovich Kryukov 19-Dec-11 15:11pm

How do you know that 1M/s and 12M/s represent real speed, not just claimed? Did you time it by yourself? Did you time in using the same hosts?
--SA

Scalee 19-Dec-11 17:05pm

I simply ran speed tests on the machines.

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-12-19T09:17:00

I can see only two possibilities right now: 1) nfs.CanWrite is excessive (but hardly could affect your throughput much), 2) your buffer size is not optimal.

However, you cannot use arbitrary-size buffer in your code and improve performance. You should also check the maximum buffer size configured in your system. See http://msdn.microsoft.com/en-us/library/ms819736.aspx[^].

—SA