I have a strange situation regarding a Windows\u00a0PC which is showing limited internet transfer speeds for no apparent reason. If I am performing the same test on Linux box then I am getting good speed.<\/p>\n\n\n\n
Upon intense debugging,\u00a0I am able to diagnose and find out the root cause of the problem.<\/p>\n\n\n\n
It was\/is Windows HTTP packet fragmentation that happens locally. Basically its
how windows compile HTTP headers locally so found a fix to it.<\/p>\n\n\n\n
We came across some TCP settings which restrict download speed in the windows
box, hence in order to permit download of large files, have modified below
settings:<\/p>\n\n\n\n
These were my initial TCP settings<\/p>\n\n\n\n
C:\\Windows\\system32>netsh interface tcp show global<\/p>
Querying active state…<\/p>
TCP Global Parameters<\/p>
———————————————-<\/p>
Receive-Side Scaling State: disabled<\/p>
Chimney Offload State : automatic<\/p>
NetDMA State: enabled<\/p>
Direct Cache Acess (DCA): disabled<\/p>
Receive Window Auto-Tuning Level: disabled<\/p>
Add-On Congestion Control Provider: none<\/p>
ECN Capability: disabled<\/p>
RFC 1323 Timestamps : disabled<\/p>
** The above autotuninglevel setting is the result of Windows Scaling heuristics<\/p>
overriding any local\/policy configuration on at least one profile.<\/p>
C:\\Windows\\system32>netsh interface tcp show heuristics<\/p>
TCP Window Scaling heuristics Parameters<\/p>
———————————————-<\/p>
Window Scaling heuristics : enabled<\/p>
Qualifying Destination Threshold: 3<\/p>
Profile type unknown: normal<\/p>
Profile type public : normal<\/p>
Profile type private: restricted<\/p>
Profile type domain : normal<\/p><\/blockquote>\n\n\n\n
Thus I did:<\/p>\n\n\n\n
# disable heuristics<\/p>
C:\\Windows\\system32>netsh interface tcp set heuristics wsh=disabled<\/p>
Ok.<\/p>
# enable receive-side scaling<\/p>
C:\\Windows\\system32>netsh int tcp set global rss=enabled<\/p>
Ok.<\/p>
# manually set autotuning profile<\/p>
C:\\Windows\\system32>netsh interface tcp set global autotuning=experimental<\/p>
Ok.<\/p>
# set congestion provider<\/p>
C:\\Windows\\system32>netsh interface tcp set global congestionprovider=ctcp<\/p>
Ok.<\/p>
C:\\Windows\\system32>netsh interface tcp show global<\/p>
Querying active state…<\/p>
TCP Global Parameters<\/p>
———————————————-<\/p>
Receive-Side Scaling State: enabled<\/p>
Chimney Offload State : automatic<\/p>
NetDMA State: enabled<\/p>
Direct Cache Acess (DCA): disabled<\/p>
Receive Window Auto-Tuning Level: experimental<\/p>
Add-On Congestion Control Provider: ctcp<\/p>
ECN Capability: disabled<\/p>
RFC 1323 Timestamps : disabled<\/p><\/blockquote>\n\n\n\n
After changing these settings downloading is fast again, hitting the internet connection’s limit.<\/p>\n","protected":false},"excerpt":{"rendered":"
I have a strange situation regarding a Windows\u00a0PC which is showing limited internet transfer speeds for no apparent reason. If I am performing the same test on Linux box then I am getting good speed. Upon intense debugging,\u00a0I am able to diagnose and find out the root cause of the problem. It was\/is Windows HTTP […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[34,37],"tags":[],"class_list":["post-300","post","type-post","status-publish","format-standard","hentry","category-linux","category-windows"],"jetpack_publicize_connections":[],"yoast_head":"\n
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