diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 7e2e08e..8bd2545 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -1,25 +1,65 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 [[package]]
-name = "linked_list_allocator"
-version = "0.6.3"
+name = "bitflags"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
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+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "spin 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "spin 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "cfg-if"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "isomorphic_drivers"
+version = "0.1.0"
+source = "git+https://github.com/rcore-os/isomorphic_drivers#6716a5df04455ff58d90e296ec4fcd7f40f878e9"
+dependencies = [
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+ "spin 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "volatile 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
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 version = "0.1.0"
 dependencies = [
- "linked_list_allocator 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "buddy_system_allocator 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "isomorphic_drivers 0.1.0 (git+https://github.com/rcore-os/isomorphic_drivers)",
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 name = "spin"
-version = "0.4.10"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "volatile"
+version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
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diff --git a/rust/src/bin/genpkts.rs b/rust/src/bin/genpkts.rs
index 758091f..e7d7366 100644
--- a/rust/src/bin/genpkts.rs
+++ b/rust/src/bin/genpkts.rs
@@ -69,7 +69,8 @@ pub fn main() {
         0x0a, 0x00, 0x00, 0x02, // ip
         0x00, 0x16, 0x31, 0xff, 0xa4, 0x9f, // mac
         0x0a, 0x00, 0x00, 0x01]; // ip
-    let tx_batch = vec![&data[..]; 1024];
+    let size = 2048;
+    let tx_batch = vec![&data[..]; size];
     println!("IXGBE driver waiting for link up");
     while !ixgbe.is_link_up() {}
     println!("IXGBE driver link is up");
@@ -80,6 +81,8 @@ pub fn main() {
             0x00, 0x16, 0x31, 0xff, 0xa4, 0x9f, // mac
             0xff, 0xff]; // unknown
             */
-        ixgbe.msend(tx_batch.as_slice());
+        if ixgbe.msend(tx_batch.as_slice()) < size {
+            println!("Waiting for queue");
+        }
     }
 }