[CentOS] network problems

Nataraj incoming-centos at rjl.com
Thu Mar 1 17:29:10 EST 2012


On 03/01/2012 08:15 AM, m.roth at 5-cent.us wrote:
> We just moved a user, who deals with a *lot* of data, to a new server,
> since his old NFS home directory was on a disk that had started showing
> problems.
>
> Now, i/o is about six times slower, my manager reports.
>
> After a fair bit of googling, I started looking at tc and ip, and found
> the following: from ip address show, first, on the old home directory
> server,
>  eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast qlen 1000
> then, on the new:
>  eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
>
> I've tried tc qdisc add dev eth0 mq pfifo_fast
> and
> tc qdisc add dev eth0  pfifo_fast
>
> and neither works. I've googled, and seen something about you can't set
> something with tc, because pfifo_fast is the hardwired default.
>
> Anyone know how I can reset this, or is there a package I can reinstall
> that would do that?
>
>          mark
>
>
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Are you sure your performance problems are network related?  Have you
measured performance of the filesystems on the two servers?   You may
have a data alignment problem with your disk partitions.

Nataraj



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