Re: REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds]
From: Eric Dumazet <hidden>
Date: 2014-02-08 13:53:37
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- 2014-02-08 · REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds] · Thomas Glanzmann <hidden>
- 2014-02-08 · REGRESSION f54b311142a92ea2e42598e347b84e1655caf8e3 tcp auto corking slows down iSCSI file system creation by factor of 70 [WAS: 4 TB VMFS creation takes 15 minutes vs 26 seconds] · Thomas Glanzmann <hidden>
On Sat, 2014-02-08 at 14:37 +0100, Thomas Glanzmann wrote:
Hello Eric,
It fixes my case but if you look at the round trip time it is not even close what it used to be. So while this fixes my problem I'm still for disabling it by default. https://thomas.glanzmann.de/tmp/tcp_auto_corking_on_patched.pcap.bz2 https://thomas.glanzmann.de/tmp/screenshot-mini-2014-02-08-14:36:25.png
Very nice. Now we have to check your NIC and how TX completion is performed. What is your NIC model and driver ?