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[Xen-devel] Reducing I/O introduced domain scheduling
| To: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Reducing I/O introduced domain scheduling |
| From: | "Dong, Eddie" <eddie.dong@xxxxxxxxx> |
| Date: | Tue, 12 Oct 2010 09:12:08 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Dong, Eddie" <eddie.dong@xxxxxxxxx>, "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx> |
| Delivery-date: | Mon, 11 Oct 2010 18:17:39 -0700 |
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| Thread-index: | Actpqn3hWuzhnq6kR7m69TDVjf/L0A== |
| Thread-topic: | Reducing I/O introduced domain scheduling |
Keir:
When running vConsolidation on top of Xen in a 4-core platform, we
noticed the I/O introduced scheduling per CPU is ~3K Hz, which seems to be too
frequent and cause frequent involve of domain 0 / Qemu, which may polute cache
of the guest and thus increase CPI (cycle per instruction).
We are thinking if we can reduce the domin switch here, and think the
output of I/O can be buffered and return immediately. The buffered I/O can be
flushed out at next IN emulation (or any Hypervisor emulated I/O) or timeout
such as 10 or 100 us to guarantee minimal response.
Ideally it can cover both PIO & MMIO, but we can start from PIO.
How do you think of that?
Thx, Eddie
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