Hi, Recently when sending large quantity of data over the network to a C# recipient running on Mono (3.2.3 on Debian Wheezy) I observed very degraded performance, close to unbearable.
I managed to pinpoint the offending lines in my code that gave arise to the poor performance. The cause was the setting of the ReceiveBufferSize & SendBufferSize properties on the Socket and/or the TCPClient class. Regardless of the values I tried to set, they would always be set to approx 2000 bytes, much smaller than the default values observed when not setting these properties at all. I filed a bug https://bugzilla.xamarin.com/show_bug.cgi?id=16021 I also saw this, I think related issue http://lists.ximian.com/pipermail/mono-list/2013-June/050008.html Moreover I think this bug is also related : https://bugzilla.xamarin.com/show_bug.cgi?id=12754 (but I think the explanation is wrong) But in summary my fix was to amend the code in /mono/metadata/socket-io.c Original : void ves_icall_System_Net_Sockets_Socket_SetSocketOption_internal(SOCKET sock, gint32 level, gint32 name, MonoObject *obj_val, MonoArray *byte_val, gint32 int_val, gint32 *error) { struct linger linger; int system_level; int system_name; int ret; To : void ves_icall_System_Net_Sockets_Socket_SetSocketOption_internal(SOCKET sock, gint32 level, gint32 name, MonoObject *obj_val, MonoArray *byte_val, gint32 int_val_in, gint32 *error) { struct linger linger; int system_level; int system_name; int ret; int int_val = int_val_in; I hope the bug is fixed in the next version. Regards N ___________________________________________________________ This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited. Please refer to http://www.bnpparibas.co.uk/en/email-disclaimer/ for additional disclosures.
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