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Re: [Qemu-devel] [PATCH] block/iscsi: handle BUSY condition


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH] block/iscsi: handle BUSY condition
Date: Fri, 30 May 2014 11:05:28 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Il 30/05/2014 11:04, Peter Lieven ha scritto:
Am 30.05.2014 07:50, schrieb Paolo Bonzini:
Il 29/05/2014 22:25, Peter Lieven ha scritto:
Am 29.05.2014 21:17, schrieb Paolo Bonzini:
Il 29/05/2014 20:41, Peter Lieven ha scritto:
static inline unsigned geo_rand_range(double m, double n) {
    return exp((log(m) + (double)rand() /
               (RAND_MAX / (log(n) - log(m) + log(1)) + log(1))));
}

Yes, exactly (except that log(1) is zero, and was only needed in your case 
because you were using integers).

Regarding aio_timer_new vs. aio_timer_init. Shall we really have the complete 
QEMU_TIMER struct in each
iTask? We need this retry_timer only in the really rare case of a BUSY.

Ok, makes sense.  Though the overall cost of IscsiTasks should be less than 4k 
per block device with a separate QemuTimer, and 8k if you embed it.

Otherwise the patch looks good, thanks!

Okay, when are you preparing the next pull request?

After the dataplane patches go in. But you can send the patch now, I'll rebase.

Paolo





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