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Re: [Xen-devel] Data broken during FTP test

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, "Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>, "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Data broken during FTP test
From: "Kasai Takanori" <kasai.takanori@xxxxxxxxxxxxxx>
Date: Thu, 19 Apr 2007 10:36:45 +0900
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Hi Keir,

Thank you for reply.

However, this problem doesn't happen because of the change in the setting.
1. SG(scatter/gather) flag off
2. 'mem=1G' is set as a boot parameter, and SG(scatter/gather) flag on.

This might indicate a high-memory bug in the net driver(s). The TCP re-send
theory makes no sense -- the decision to re-send is always made by the TCP
protocol stack in the domU. dom0 itself will never decide to re-send.

How much memory does your test system have? Are you running 64-bit Xen, PAE
Xen, or non-PAE 32-bit Xen?

The environment of the machine is as follows.

Machine : PRIMERGY model RX200S3
CPU     : Xeon 5160 3.0 GHz * 2
Memory  : 12 GB(2048 MB * 6)
HDD     : AL-9LX 73GB * 2 (Onboard IME RAID1)
NIC     : Broadcom Corporation NetXtreme BC5715 Gigabit Ethernet (rev a3) * 2
         Intel Corporation 82545GM Gigabit Ethernet Controller (rev 04)  * 1
OS      : Red Hat Enterprise Linux 5 GA

It is confirmed that this problem happens similarly on NIC of the Intel Corporation.

Best Regards,

Takanori Kasai

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