[Openais] RE: Need help to reduce the time wait‏ of saRecvRetry()

[Ratbag Patrick]

The test environment is simple. There are two nodes, one node A creat a checkpoint and do some write in a tight loop, then the physical connection is dropped, at the same time(about 10ms later than A's physical connection dropped) if the other node B wanna do saCkptCheckpointOpen or saCkptCheckpointRead of the opened checkpoint, it will be blocked at saRecvRetry for 3 seconds. After that saRecvRetry will return with OK. The checkpoint is about 3MB, and the network connection between A and B is 1Gbps.


Thanks.


> Subject: Re: [Openais] Need help to reduce the time wait‏ of saRecvRetry()
> From: sdake at redhat.com
> To: ratbag at live.com
> CC: openais at lists.linux-foundation.org
> Date: Mon, 20 Oct 2008 13:14:58 -0700
>
>
> On Mon, 2008-10-20 at 14:20 +0800, Ratbag Patrick wrote:
>> How To Reproduce:
>> Using the latest version of whitetank, creat one ckpt, then if one
>> node's physical network connection is dropped(like unplug the RJ45
>> jacket), then at the same time the other node will be blocked at
>> saRecvRetry() for about 3 seconds.
>>
>>
>> Actually it's not acceptable in my envronment. Could anyone tell me
>> how to reduce the blocked time(like 3s to 100ms) or tell me if it's a
>> bug?
>>
>
> I'll take a look when I have an opportunity.
>
> What is the other node doing in saRecvRetry? Reading the checkpoint in
> a tight loop?
>
> If you have many checkpoints that call should still not block but might
> return SA_AIS_ERR_TRY_AGAIN for some long period of time.
>
> Regards
> -steve
>
>> Thanks!
>>
>> _______________________________________________
>> Openais mailing list
>> Openais at lists.linux-foundation.org
>> https://lists.linux-foundation.org/mailman/listinfo/openais
>

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